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CONTENTS

CHAPTER ONE: THE JOURNEY TO HOGWARTS

King’s Cross Station

Platform Nine and Three-Quarters

The Hogwarts Express

CHAPTER TWO: THE SORTING

The Sorting Hat

Hatstall

CHAPTER THREE: THE CASTLE AND GROUNDS

Hufflepuff Common Room

The Marauder’s Map

The Great Lake

CHAPTER FOUR: LESSONS AT HOGWARTS

Hogwarts School Subjects

Time-Turner

CHAPTER FIVE: CASTLE RESIDENTS

Hogwarts Ghosts

Ghosts

The Ballad of Nearly Headless Nick

Hogwarts Portraits

Sir Cadogan

CHAPTER SIX: SECRETS OF THE CASTLE

Mirror of Erised

Pensieve

The Philosopher’s Stone

The Sword of Gryffindor

The Chamber of Secrets

FROM THE POTTERMORE EDITOR:

We know quite a lot about Hogwarts. It’s a school for witches and wizards, who are invited to attend by an owl-delivered letter. It has a hundred and forty-two staircases, which move as though they have minds of their own. It was founded by Godric Gryffindor, Rowena Ravenclaw, Helga Hufflepuff and Salazar Slytherin, after whom the school’s houses were named.

There’s even a secret passageway under a one-eyed witch statue that allows a fairly thin person to escape into the cellar of Honeydukes. But if Professor Albus Percival Wulfric Brian Dumbledore says even he doesn’t know all of Hogwarts’ secrets, well, neither do we.

There’s only one person who knows everything about Hogwarts. In this collection of writing, J.K. Rowling divulges hidden secrets and strange lore from Britain’s school for witchcraft and wizardry.

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We begin just as any witch or wizard on his or her way to Hogwarts would – at London’s King’s Cross. It’s a bustling, cavernous train station filled with busy commuters – so busy that they don’t notice people laden with trunks, owls, cats and robes run at a ticket barrier and disappear.

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KING’S CROSS STATION
BY J.K. ROWLING

When Ottaline Gambol commandeered a Muggle train to serve as the new mode of transport for Hogwarts students, she also had constructed a small station in the wizarding village of Hogsmeade: a necessary adjunct to the train. The Ministry of Magic felt strongly, however, that to construct an additional wizarding station in the middle of London would stretch even the Muggles’ notorious determination not to notice magic when it was exploding in front of their faces.

It was Evangeline Orpington, Minister from 1849–1855, who hit upon the solution of adding a concealed platform at the newly (Muggle) built King’s Cross station, which would be accessible only to witches and wizards. On the whole, this has worked well, although there have been minor problems over the ensuing years, such as witches and wizards who have dropped suitcases full of biting spellbooks or newt spleens all over the polished station floor, or else disappeared through the solid barrier a little too loudly. There are usually a number of plain-clothed Ministry of Magic employees on hand to deal with any inconvenient Muggle memories that may need altering at the start and end of each Hogwarts term.

J.K. Rowling’s thoughts

King’s Cross, which is one of London’s main railway stations, has a very personal significance for me, because my parents met on a train to Scotland which departed from King’s Cross station. For this reason, and because it has such an evocative and symbolic name, and because it is actually the right station to leave from if you were heading to Caledonia, I never knew the slightest indecision about the location of the portal that would take Harry to Hogwarts, or the means of transport that would take him there.

It is said (though where the story originated I could not tell you; it is suspiciously vague) that King’s Cross Station was built either on the site of Boudicca’s last battle (Boudicca was an ancient British queen who led a rebellion against the Romans) or on the site of her tomb. Legend has it that her grave is situated somewhere in the region of platforms eight to ten. I did not know this when I gave the wizards’ platform its number. King’s Cross station takes its name from a now-demolished monument to King George IV.

There is a real trolley stuck halfway out of a wall in King’s Cross now, and it makes me beam proudly every time I pass...

There is no doubt that a train from King’s Cross is the most reliable way to get a young witch or wizard to Hogwarts (flying cars are strongly discouraged). But why platform nine and three-quarters? And what other hidden platforms might be tucked away behind those walls?

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PLATFORM NINE
AND THREE-QUARTERS

J.K. Rowling’s thoughts

In choosing the number of the concealed platform that would take young witches and wizards to boarding school, I decided that it would have to be a number between those of the Muggle platforms – therefore, it was clearly a fraction. This raised the interesting question of how many other fractional platforms lay between the whole-numbered platforms at King’s Cross, and I concluded that there were probably quite a few. Although these are never mentioned in the book, I like to think that it is possible to take a version of the Orient Express off to wizard-only villages in continental Europe (try platform seven and a half), and that other platforms may be opened on an as-required-basis, for instance for large, one-off events such as Celestina Warbeck concerts (see your ticket for details).

The number nine and three-quarters presented itself without much conscious thought, and I liked it so much that I took it at once. It is the ‘three-quarters’ that makes it, of course.

Next, it’s only logical to jump onto the Hogwarts Express, which fills with new and returning students of witchcraft and wizardry each year and drops them off at school.

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THE HOGWARTS EXPRESS
BY J.K. ROWLING

As we know from early historical accounts, and from the evidence of early woodcuts and engravings, Hogwarts students used to arrive at school in any manner that caught their fancy. Some rode broomsticks (a difficult feat when carrying trunks and pets); others commandeered enchanted carts and, later, carriages; some attempted to Apparate (often with disastrous effects, as the castle and grounds have always been protected with Anti-Apparition Charms); others rode a variety of magical creatures.

(Indeed, it is believed that the Thestrals currently living in the Forbidden Forest, and trained to pull the school carriages from Hogsmeade Station, are descendants of those ridden by students to school long ago.)

In spite of the accidents attendant on these various modes of magical transport, not to mention the annual Muggle sightings of vast numbers of airborne wizards travelling northwards, it remained the responsibility of parents to convey their children to school, right up until the imposition of the International Statute of Secrecy in 1692. At this point, it became a matter of urgency to find some more discreet method of transporting hundreds of wizarding children from all over Britain to their secret school in the Highlands of Scotland.

Portkeys were therefore arranged at collecting points all over Britain. The logistics caused problems from the start. Up to a third of students would fail to arrive every year, having missed their time slot, or been unable to find the unobtrusive enchanted object that would transport them to their school. There was also the unfortunate fact that many children were (and are) ‘Portkey-sick’, and the hospital wing was frequently full to bursting for the first few days of every year, while susceptible students overcame their hysterics and nausea.

While admitting that Portkeys were not an ideal solution to the problem of school transportation, the Ministry of Magic failed to find an acceptable alternative. A return to the unregulated travel of the past was impossible, and yet a more secure route into the school (for instance, permitting a fireplace that might be officially entered by Floo powder) was strongly resisted by successive Headmasters, who did not wish the security of the castle to be breached.

A daring and controversial solution to the thorny problem was finally suggested by Minister for Magic Ottaline Gambol, who was much intrigued by Muggle inventions and saw the potential in trains. Where exactly the Hogwarts Express came from has never been conclusively proven, although it is a fact that there are secret records at the Ministry of Magic detailing a mass operation involving one hundred and sixty-seven Memory Charms and the largest ever mass Concealment Charm performed in Britain. The morning after these alleged crimes, a gleaming scarlet steam engine and carriages astounded the villagers of Hogsmeade (who had also not realised they had a railway station), while several bemused Muggle railway workers down in Crewe spent the rest of the year grappling with the uncomfortable feeling that they had mislaid something important.

The Hogwarts Express underwent several magical modifications before the Ministry approved it for school use. Many pure-blood families were outraged at the idea of their children using Muggle transport, which they claimed was unsafe, insanitary and demeaning; however, as the Ministry decreed that students either rode the train or did not attend school, the objections were swiftly silenced.

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First-year Hogwarts students are hustled into the Great Hall for the wizarding world’s most discerning personality test. As each young witch and wizard is called forward, an infinitely wise talking hat is placed on his or her head. We know what the Sorting Hat does, but how much do we know about how it was created?

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THE SORTING HAT
BY J.K. ROWLING

The famous Hogwarts Sorting Hat gives an account of its own genesis in a series of songs sung at the beginning of each school year. Legend has it that the hat once belonged to one of the four founders, Godric Gryffindor, and that it was jointly enchanted by all four founders to ensure that students would be sorted into their eponymous houses, which would be selected according to each founder’s particular preferences in students.

The Sorting Hat is one of the cleverest enchanted objects most witches and wizards will ever meet. It literally contains the intelligence of the four founders, can speak (through a rip near its brim) and is skilled at Legilimency, which enables it to look into the wearer’s head and divine his or her capabilities or mood. It can even respond to the thoughts of the wearer.

The Sorting Hat has another ability, which has rarely been revealed to anyone at Hogwarts. It is a magical portal, by which another of Godric Gryffindor’s possessions may be accessed: the sword of Gryffindor. This sword was enchanted by Godric to appear whenever a member of his house asks for help while wearing the Hat. Twice, in the course of the Harry Potter series, the sword is transported from a temporary owner to aid a Gryffindor who needs a weapon.

The Sorting Hat is notorious for refusing to admit it has made a mistake in its sorting of a student. On those occasions when Slytherins behave altruistically or selflessly, when Ravenclaws flunk all their exams, when Hufflepuffs prove lazy yet academically gifted and when Gryffindors exhibit cowardice, the Hat steadfastly backs its original decision. On balance, however, the Hat has made remarkably few errors of judgement over the many centuries it has been at work.

J.K. Rowling’s thoughts

The Sorting Hat does not appear in my earliest plans for Hogwarts. I debated several different methods for sorting students (because I knew from early on that there would be four houses, all with very different qualities). The first was an elaborate, Heath Robinson-ish machine that did all kinds of magical things before reaching a decision, but I did not like it: it felt at once too complicated and too easy. Next I placed four statues of the four founders in the Entrance Hall, which came alive and selected students from the throng in front of them while the school watched. This was better, but still not quite right. Finally, I wrote a list of the ways in which people can be chosen: eeny meeny miny mo, short straws, chosen by team captains, names out of a hat – names out of a talking hat – putting on a hat – the Sorting Hat.

The Sorting Hat is very wise. But dividing the magical student population of Hogwarts into four houses is a difficult task. Sometimes the Sorting Hat gets stumped. It’s rare for the Hat to really take its time deciding where a student belongs, but there is a term for when it happens.

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‌HATSTALL
BY J.K. ROWLING

An archaic Hogwarts term for any new student whose Sorting takes longer than five minutes. This is an exceptionally long time for the Sorting Hat to deliberate, and occurs rarely, perhaps once every fifty years.

Of Harry Potter’s contemporaries, Hermione Granger and Neville Longbottom came closest to being Hatstalls. The Sorting Hat spent nearly four minutes trying to decide whether it should place Hermione in Ravenclaw or Gryffindor. In Neville’s case, the Hat was determined to place him in Gryffindor: Neville, intimidated by that house’s reputation for bravery, requested a placing in Hufflepuff. Their silent wrangling resulted in triumph for the Hat.

The only true Hatstalls known personally to Harry Potter were Minerva McGonagall and Peter Pettigrew. The former caused the Hat to agonise for five and a half minutes as to whether Minerva ought to go to Ravenclaw or Gryffindor; the latter was placed in Gryffindor after a long deliberation between that house and Slytherin. The Sorting Hat, which is infamously stubborn, still refuses to accept that its decision in the case of the latter may have been erroneous, citing the manner in which Pettigrew died as (dubious) evidence.

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Hogwarts is a magical, enchanting and grand labyrinth with dungeons and towers, a foul-tempered tree, a sprawling lake full of merpeople, and grounds that are home to magical creatures. Let’s start with a place Harry Potter never visited himself: the Hufflepuff Common Room, where the kind at heart rest their hard-working heads.

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HUFFLEPUFF COMMON ROOM
BY J.K. ROWLING

The Hufflepuff common room is entered from the same corridor as the Hogwarts kitchens. Proceeding past the large still life that forms the entrance to the latter, a pile of large barrels is to be found stacked in a shadowy stone recess on the right-hand side of the corridor. The barrel two from the bottom, middle of the second row, will open if tapped in the rhythm of ‘Helga Hufflepuff’.* As a security device to repel non-Hufflepuffs, tapping on the wrong barrel, or tapping the incorrect number of times, results in one of the other lids bursting off and drenching the interloper in vinegar.

A sloping, earthy passage inside the barrel travels upwards a little way until a cosy, round, low-ceilinged room is revealed, reminiscent of a badger’s set. The room is decorated in the cheerful, bee-like colours of yellow and black, emphasised by the use of highly polished, honey-coloured wood for the tables and the round doors that lead to the boys’ and girls’ dormitories (furnished with comfortable wooden bedsteads, all covered in patchwork quilts).

A colourful profusion of plants and flowers seem to relish the atmosphere of the Hufflepuff common room: various cacti stand on wooden circular shelves (curved to fit the walls), many of them waving and dancing at passers-by, while copper-bottomed plant holders dangling amid the ceiling cause tendrils of ferns and ivies to brush your hair as you pass under them.

A portrait over the wooden mantelpiece (carved all over with decorative dancing badgers) shows Helga Hufflepuff, one of the four founders of Hogwarts School, toasting her students with a tiny, two-handled golden cup. Small, round windows just level with the ground at the foot of the castle show a pleasant view of rippling grass and dandelions, and, occasionally, passing feet. These low windows notwithstanding, the room feels perennially sunny.

* The complexity or otherwise of the entrance to the common rooms might be said to give a very rough idea of the intellectual reputation of each house: Hufflepuff has an unchanging portal and requires rhythmic tapping; Slytherin and Gryffindor have doorways that challenge the would-be entrant about equally, the former having an almost imperceptible hidden entrance and a varying password, the latter having a capricious guardian and frequently changing passwords. In keeping with its reputation as the house of the most agile minds at Hogwarts, the door to the Ravenclaw common room presents a fresh intellectual or philosophical challenge every time a person knocks on it.

Nevertheless, it ought not to be concluded from the above that Hufflepuffs are dimwits or duffers, though they have been cruelly caricatured that way on occasion. Several outstanding brains have emerged from Hufflepuff House over the centuries; these fine minds simply happened to be allied to outstanding qualities of patience, a strong work ethic and constancy, all traditional hallmarks of Hufflepuff House.

J.K. Rowling’s thoughts

When I first planned the series, I expected Harry to visit all four house common rooms during his time at Hogwarts. There came a point when I realised that there was never going to be a valid reason to enter the Hufflepuff room. Nevertheless, it is quite as real to me as the other three, and I always knew exactly where those Hufflepuffs were going when they headed off towards the kitchens after lessons.

Harry may never have been to the Hufflepuff common room, but he did end up in possession of a foolproof way of finding his way around the rest of the castle. Fred and George Weasley gave him something James Potter and his friends made when they were at school – the Marauder’s Map. ‘I solemnly swear that I am up to no good’.

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THE MARAUDER’S MAP
BY J.K. ROWLING

Perhaps no students (even including Harry Potter, Ron Weasley, Hermione Granger and Tom Riddle) have ever explored the castle and grounds of Hogwarts as thoroughly and illicitly as the four creators and contributors to the Marauder’s Map: James Potter, Sirius Black, Remus Lupin and Peter Pettigrew.

James, Sirius and Peter were not initially impelled to explore the school grounds by night out of devilment alone (though that played its part), but by their desire to help their dear friend Remus Lupin to bear his lycanthropy. Prior to the invention of the Wolfsbane Potion, Lupin was compelled to undergo an excruciating transformation every full moon. Once his condition was discovered by his three best friends, they sought a way to render his transformations less solitary and painful, which led to them learning to become (unregistered) Animagi, so that they could keep him company without harm to themselves. The ability of Sirius Black, Peter Pettigrew and James Potter to become, respectively, a dog, a rat and a stag, enabled them to explore the castle grounds by night undetected. The interior of the castle, meanwhile, was mapped over time with the help of James Potter’s Invisibility Cloak.

The Marauder’s Map is lasting testimony to the advanced magical ability of the four friends who included Harry Potter’s father, godfather and favourite teacher. The map they created during their time at Hogwarts appears to be a blank piece of parchment unless activated by the phrase: ‘I solemnly swear that I am up to no good’, a phrase that, in the case of three of the four makers, should be understood as a joke. The ‘no good’ of which they wrote never denoted Dark magic, but school rule-breaking; similar bravado is evinced by their use of their own nicknames on the map (‘Messrs Moony, Wormtail, Padfoot and Prongs’).

The magic used in the map’s creation is advanced and impressive; it includes the Homonculous Charm, enabling the possessor of the map to track the movements of every person in the castle, and it was also enchanted to forever repel (as insultingly as possible) the curiosity of their nemesis, Severus Snape.

Although the precise circumstances surrounding the makers’ loss of their map are not given in the Harry Potter novels, it is easy to conclude that they eventually over-reached themselves and were cornered by Argus Filch, probably on a tip-off from Snape, whose obsession it had become to expose his arch-rival, James Potter, in wrong-doing. The masterpiece of a map was confiscated in Sirius, James, Remus and Peter’s final year, and none of them were able to steal it back from a well-prepared and suspicious Filch. In any case, their priorities changed in their final months at school, becoming far more serious and focused on the world beyond Hogwarts, where Lord Voldemort was successfully rising to power. All four of the map’s creators would shortly be inducted into the renegade organisation headed by Albus Dumbledore, the Order of the Phoenix, and a map of their old school – no matter how ingenious – would no longer be of use to them except as a piece of nostalgia.

The Marauder’s Map was, however, of immense use to the young Weasley twins. The story of Fred and George’s acquisition of the map is told in Harry Potter and the Prisoner of Azkaban. It was a mark of their high esteem for Harry Potter, and their belief that he stood in need of assistance with a destiny none of them yet fully understood, that they later gifted the map to him, unwittingly passing it on to the child of one of the creators.

The map was subsequently confiscated from Harry Potter by a Death Eater in disguise at the school, who recognised it as a likely source of his own discovery.

J.K. Rowling’s thoughts

The Marauder’s Map subsequently became something of a bane to its true originator (me), because it allowed Harry a little too much freedom of information. I never showed Harry taking the map back from the empty office of (the supposed) Mad-Eye Moody, and I sometimes regretted that I had not capitalised on this mistake to leave it there. However, I like the moment when Harry watches Ginny’s dot moving around the school in Deathly Hallows, so on balance I am glad I let Harry reclaim his rightful property.

The Marauder’s Map could help students escape to Honeydukes, locate enemies in the Hogwarts hallways, and insult Severus Snape, but it probably wouldn’t be much help in the Great Lake. With its murky depths and magical residents, the Great Lake is one of the castle’s more mysterious locales; the site of the second task in the Triwizard Tournament and the haunt of a host of water-dwelling magical creatures, from Grindylows to the giant squid.

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‌THE GREAT LAKE
BY J.K. ROWLING

The grounds of Hogwarts function partly as a nature reserve for magical creatures which have difficulty existing in Muggle-inhabited areas.

The lake is full of creatures that would make a Muggle naturalist swoon with delight – if terror did not seize them first. There are Grindylows (vicious little water demons), merpeople (of a hardy Scottish strain) and a giant squid, which is semi-domesticated and permits students to tickle its tentacles on sunny days, when it basks in the shallows.

Giant squid genuinely exist, though they are most mysterious creatures. Although their extraordinary bodies have been washed up all over the world, it was not until 2006 that a live giant squid was captured on film by Muggles. I strongly suspect them of having magical powers.

J.K. Rowling’s thoughts

The lake is the setting for the second task that the Triwizard competitors must face in Goblet of Fire, which is also my favourite task. I find it satisfyingly creepy; I like the diversity of the methods employed by the competitors to breathe underwater, and I enjoyed plumbing the depths of a part of the grounds that had never been seen before. In the original draft of Chamber of Secrets, I had Harry and Ron crash into the lake in Mr Weasley’s Ford Anglia, and meet the merpeople there for the first time.

At that time I had a vague notion that the lake might lead to other places, and that the merpeople might play a larger role in the later books than they did, so I thought that Harry ought to be introduced to both at this stage. However, the Whomping Willow provided a more satisfying, less distracting crash, and served a later purpose in Prisoner of Azkaban, too. The Great Lake (which is really a Scottish loch, apparently freshwater and landlocked) never did develop as a portal to other seas or rivers, although the appearance of the Durmstrang ship from its depths in Goblet of Fire hints at the fact that if you are travelling by an enchanted craft, you might be able to take a magical shortcut to other waterways.

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It’s time to get down to the real business of Hogwarts: lessons. You won’t find chemistry and mathematics on the curriculum, but then you wouldn’t expect to see Potions and Arithmancy on a Muggle timetable.

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HOGWARTS SCHOOL SUBJECTS
BY J.K. ROWLING

All first-years at Hogwarts must take seven subjects: Transfiguration, Charms, Potions, History of Magic, Defence Against the Dark Arts, Astronomy and Herbology. Flying lessons (on broomsticks) are also compulsory.

At the end of their second year at Hogwarts, students are required to choose a minimum of two more subjects from the following list: Arithmancy, Muggle Studies, Divination, Study of Ancient Runes and Care of Magical Creatures.

Very specialised subjects such as Alchemy are sometimes offered in the final two years, if there is sufficient demand.

J.K. Rowling’s thoughts

A slightly different list of school subjects appears in my earliest notes. Herbology is called ‘Herbalism’, Divination is compulsory from the first year, as are Alchemy and a subject called simply ‘Beasts’, whereas Transfiguration is called ‘Transfiguration/Metamorphosis’.

If, like Hermione, nearly all of these subjects sound essential to you, then a certain magical object might come in handy. In Harry Potter and the Prisoner of Azkaban, Hermione managed to double her work load by securing the use of a Time-Turner, a magical device that enables the wearer to travel back in time. However, using a Time-Turner can have grave consequences.

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‌TIME-TURNER
BY J.K. ROWLING

In spite of the many Muggle fantasies around the subject, time travel is possible in only a limited sense even in the magical world. While the subject is shrouded in great secrecy – investigations are ongoing in the Department of Mysteries – it appears that magic can take you only so far.

According to Professor Saul Croaker, who has spent his entire career in the Department of Mysteries studying time-magic:

‘As our investigations currently stand, the longest period that may be relived without the possibility of serious harm to the traveller or to time itself is around five hours. We have been able to encase single Hour-Reversal Charms, which are unstable and benefit from containment, in small, enchanted hour-glasses that may be worn around a witch or wizard’s neck and revolved according to the number of hours the user wishes to relive.

‘All attempts to travel back further than a few hours have resulted in catastrophic harm to the witch or wizard involved. It was not realised for many years why time travellers over great distances never survived their journeys. All such experiments have been abandoned since 1899, when Eloise Mintumble became trapped, for a period of five days, in the year 1402. Now we understand that her body had aged five centuries in its return to the present and, irreparably damaged, she died in St Mungo’s Hospital for Magical Maladies and Injuries shortly after we managed to retrieve her. What is more, her five days in the distant past caused great disturbance to the life paths of all those she met, changing the course of their lives so dramatically that no fewer than twenty-five of their descendants vanished in the present, having been “un-born”.

‘Finally, there were alarming signs, during the days following Madam Mintumble’s recovery, that time itself had been disturbed by such a serious breach of its laws. Tuesday following her reappearance lasted two and a half full days, whereas Thursday shot by in the space of four hours. The Ministry of Magic had a great deal of trouble in covering this up and since that time, the most stringent laws and penalties have been placed around those studying time travel.’

Even the use of the very limited amount of Time-Turners at the Ministry’s disposal is hedged around with hundreds of laws. While not as potentially dangerous as skipping five centuries, the re-use of a single hour can still have dramatic consequences and the Ministry of Magic seeks the strictest guarantees if it permits the use of these rare and powerful objects. It would surprise most of the magical community to know that Time-Turners are generally only used to solve the most trivial problems of time-management and never for greater or more important purposes, because, as Saul Croaker tells us, ‘just as the human mind cannot comprehend time, so it cannot comprehend the damage that will ensue if we presume to tamper with its laws.’

The Ministry’s entire stock of Time-Turners was destroyed during a fight in the Department of Mysteries about three years after Hermione Granger was granted permission to use one at Hogwarts.

J.K. Rowling’s thoughts

I went far too light-heartedly into the subject of time travel in Harry Potter and the Prisoner of Azkaban. While I do not regret it (Prisoner of Azkaban is one of my favourite books in the series), it opened up a vast number of problems for me, because after all, if wizards could go back and undo problems, where were my future plots?

I solved the problem to my own satisfaction in stages. Firstly, I had Dumbledore and Hermione emphasise how dangerous it would be to be seen in the past, to remind the reader that there might be unforeseen and dangerous consequences as well as solutions in time travel. Secondly, I had Hermione give back the only Time-Turner ever to enter Hogwarts. Thirdly, I smashed all remaining Time-Turners during the battle in the Department of Mysteries, removing the possibility of reliving even short periods in the future.

This is just one example of the ways in which, when writing fantasy novels, one must be careful what one invents. For every benefit, there is usually a drawback.

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It isn’t just students and teachers who live at the school. Hogwarts is home to many others aside from the living – and these spirits have nothing but time. Among Hogwarts’ permanent residents are a colourful collection of otherworldly inhabitants.

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HOGWARTS GHOSTS
BY J.K. ROWLING

In spite of the unfounded rumours surrounding the Shrieking Shack, which was never haunted at all, Hogwarts is the most heavily haunted dwelling place in Britain (and this is against stiff competition, as there are more reported ghost sightings/sensings on these damp islands than anywhere else in the world). The castle is a congenial place for ghosts, because the living inhabitants treat their dead friends with tolerance and even affection, no matter how many times they have heard the same old reminiscences.

Each of the four Hogwarts houses has its own ghost. Slytherin boasts the Bloody Baron, who is covered in silver bloodstains. The least talkative of the house ghosts is the Grey Lady, who is long-haired and beautiful.

Hufflepuff House is haunted by the Fat Friar, who was executed because senior churchmen grew suspicious of his ability to cure the pox merely by poking peasants with a stick, and his ill-advised habit of pulling rabbits out of the communion cup. Though a genial character in general, the Fat Friar still resents the fact that he was never made a cardinal.

Gryffindor house is home to Nearly Headless Nick, who in life was Sir Nicholas de Mimsy-Porpington. Something of a snob, and a less accomplished wizard than he believed, Sir Nicholas lounged around the court of Henry VII in life, until his foolish attempt to beautify a lady-in-waiting by magic caused the unfortunate woman to sprout tusks. Sir Nicholas was stripped of his wand and inexpertly executed, leaving his head hanging off by a single flap of skin and sinew. He retains a feeling of inadequacy with regard to truly headless ghosts.

Another notable Hogwarts ghost is Moaning Myrtle, who haunts an unpopular girls’ toilet. Myrtle was a student at Hogwarts when she died, and she chose to return to school in perpetuity, with the short-term aim of haunting her arch-rival and bully, Olive Hornby. As the decades have rolled by, Myrtle has made a name for herself as the most miserable ghost in school, usually to be found lurking inside one of the toilets and filling the tiled space with her moans and howls.

J.K. Rowling’s thoughts

The inspiration for Moaning Myrtle was the frequent presence of a crying girl in communal bathrooms, especially at the parties and discos of my youth. This does not seem to happen in male bathrooms, so I enjoyed placing Harry and Ron in such uncomfortable and unfamiliar territory in Harry Potter and the Chamber of Secrets and Harry Potter and the Half-Blood Prince.

The most productive ghost at Hogwarts is, of course, Professor Binns, the old History of Magic teacher who fell asleep in front of the staff-room fire one day and simply got up to give his next class, leaving his body behind. There is some debate as to whether or not Professor Binns realises he is dead. While his entrance to lessons through the blackboard is vaguely amusing the first time students see it, he is not the most stimulating teacher.

The inspiration for Professor Binns was an old professor at my university, who gave every lecture with his eyes closed, rocking backwards and forwards slightly on his toes. While he was a brilliant man, who disgorged an immense amount of valuable information at every lecture, his disconnect with his students was total. Professor Binns is only dimly aware of his living students, and is astonished when they begin asking him questions.

In the very earliest list of ghosts I ever wrote for Hogwarts, I included Myrtle (initially named ‘Wailing Wanda’), Professor Binns, the Grey Lady (then called ‘the Whispering Lady’) and the Bloody Baron. There was also a Black Knight, The Toad (which left ectoplasm all over its classroom), and a ghost I rather regret not using: his name was Edmund Grubb, and the notes beside his name say: Expired in the doorway of the Dining Hall. Sometimes stops people getting in, out of spite. Fat Victorian ghost. (Ate poisonous berries).

Ghosts are such a normal sight to behold at Hogwarts that it’s easy to forget you don’t often see them out in the Muggle world. Of course, there’s a good explanation for that.

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‌GHOSTS
BY J.K. ROWLING

In the world of Harry Potter, a ghost is the transparent, three-dimensional imprint of a deceased witch or wizard, which continues to exist in the mortal world. Muggles cannot come back as ghosts, and the wisest witches and wizards choose not to. It is those with ‘unfinished business’, whether in the form of fear, guilt, regrets or overt attachment to the material world, who refuse to move on to the next dimension.

Having chosen a feeble simulacrum of mortal life, ghosts are limited in what they can experience. No physical pleasure remains to them, and their knowledge and outlook remains at the level it had attained during life, so that old resentments (for instance, at having an incompletely severed neck) continue to rankle after several centuries. For this reason, ghosts tend to be poor company, on the whole. They are especially disappointing on the one subject that fascinates most people: ghosts cannot return a very sensible answer on what it is like to die, because they have chosen an impoverished version of life instead.

Ghosts can pass through solid objects without causing damage to themselves or the material, but create disturbances in water, fire and air. The temperature drops in the immediate vicinity of a ghost, an effect intensified if many congregate in the same place. Their appearance can also turn flames blue. Should part or all of a ghost pass through a living creature, the latter will experience a freezing sensation as though they have been plunged into ice-cold water.

Witches and wizards are much more susceptible to what Muggles call paranormal activity, and will see (and hear) ghosts plainly, where a Muggle might only feel that a haunted place is cold or ‘creepy’. Muggles who insist that they see ghosts in perfect focus are either a) lying or b) wizards showing off – and in flagrant breach of the International Statute of Secrecy.

The circumstances around Nearly Headless Nick’s botched beheading were never explained in the Harry Potter series, but they’re a mystery no longer. You’ll find out exactly what happened to the aggrieved ghost (straight from Nick himself) in the following ballad, which was axed from an early draft of Harry Potter and the Chamber of Secrets.

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THE BALLAD OF NEARLY HEADLESS NICK
BY J.K. ROWLING

It was a mistake any wizard could make

Who was tired and caught on the hop

One piffling error, and then, to my terror,

I found myself facing the chop.

Alas for the eve when I met Lady Grieve

A-strolling the park in the dusk!

She was of the belief I could straighten her teeth

Next moment she’d sprouted a tusk.

I cried through the night that I’d soon put her right

But the process of justice was lax;

They’d brought out the block, though they’d mislaid the rock

Where they usually sharpened the axe.

Next morning at dawn, with a face most forlorn,

The priest said to try not to cry,

‘You can come just like that, no, you won’t need a hat,’

And I knew that my end must be nigh.

The man in the mask who would have the sad task

Of cleaving my head from my neck,

Said ‘Nick, if you please, will you get to your knees,’

And I turned to a gibbering wreck.

‘This may sting a bit’ said the cack-handed twit

As he swung the axe up in the air,

But oh the blunt blade! No difference it made,

My head was still definitely there.

The axeman he hacked and he whacked and he thwacked,

‘Won’t be too long’, he assured me,

But quick it was not, and the bone-headed clot

Took forty-five goes ’til he floored me.

And so I was dead, but my faithful old head

It never saw fit to desert me,

It still lingers on, that’s the end of my song,

And now, please applaud, or you’ll hurt me.

Nearly Headless Nick and Moaning Myrtle aren’t the only permanent residents of Hogwarts. The castle walls are lined with portraits whose subjects can move, speak and interact with students – including the Fat Lady, who guards the entrance to Gryffindor Tower, and the many previous headmasters who are more than ready to offer advice to their successors.

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HOGWARTS PORTRAITS
BY J.K. ROWLING

Hogwarts portraits are able to talk and move around from picture to picture. They behave like their subjects. However, the degree to which they can interact with the people looking at them depends not on the skill of the painter, but on the power of the witch or wizard painted.

When a magical portrait is taken, the witch or wizard artist will naturally use enchantments to ensure that the painting will be able to move in the usual way. The portrait will be able to use some of the subject’s favourite phrases and imitate their general demeanour. Thus, Sir Cadogan’s portrait is forever challenging people to a fight, falling off its horse and behaving in a fairly unbalanced way, which is how the subject appeared to the poor wizard who had to paint him, while the portrait of the Fat Lady continues to indulge her love of good food, drink and tip-top security long after her living model passed away.

However, neither of these portraits would be capable of having a particularly in-depth discussion about more complex aspects of their lives: they are literally and metaphorically two-dimensional. They are only representations of the living subjects as seen by the artist.

Some magical portraits are capable of considerably more interaction with the living world. Traditionally, a headmaster or headmistress is painted before their death. Once the portrait is completed, the headmaster or headmistress in question keeps it under lock and key, regularly visiting it in its cupboard (if so desired) to teach it to act and behave exactly like themselves, and imparting all kinds of useful memories and pieces of knowledge that may then be shared through the centuries with their successors in office.

The depth of knowledge and insight contained in some of the headmasters’ and headmistresses’ portraits is unknown to any but the incumbents of the office and the few students who have realised, over the centuries, that the portraits’ apparent sleepiness when visitors arrive in the office is not necessarily genuine.

Perhaps the most outspoken portrait to grace the castle walls is Sir Cadogan, who Harry, Ron and Hermione encountered in their third year at Hogwarts. Often seen chasing after his fat pony, Sir Cadogan is a boastful knight who challenges passers-by to duels whenever he is given the opportunity. Legend has it that Sir Cadogan was as brash and brave in life as he appears to be in his portrait.

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‌SIR CADOGAN
BY J.K. ROWLING

BIRTHDAY:

Unknown

WAND:

(According to legend) Blackthorn and troll whisker, nine inches, combustible

HOGWARTS HOUSE:

Gryffindor

SPECIAL ABILITIES:

Insane bravery

PARENTAGE:

Wizard father, witch mother

FAMILY:

Three wives are believed to have left him, rumoured to have had seventeen known children

Before the wizarding community was forced into hiding, it was not unusual for a wizard to live in the Muggle community and hold down what we would now think of as a Muggle job.

It is widely believed in wizarding circles that Sir Cadogan was one of the famous Knights of the Round Table, albeit a little-known one, and that he achieved this position through his friendship with Merlin. He has certainly been excised from all Muggle volumes of King Arthur’s story, but wizarding versions of the tales include Sir Cadogan alongside Sir Lancelot, Sir Bedivere and Sir Percivale. These tales reveal him to be hot-headed and peppery, and brave to the point of foolhardiness, but a good man in a corner.

Sir Cadogan’s most famous encounter was with the Wyvern of Wye, a dragonish creature that was terrorizing the West Country. At their first encounter, the beast ate Sir Cadogan’s handsome steed, bit his wand in half and melted his sword and visor. Unable to see through the steam rising from his melting helmet, Sir Cadogan barely escaped with his life. However, rather than running away, he staggered into a nearby meadow, grabbed a small, fat pony grazing there, leapt upon it and galloped back towards the wyvern with nothing but his broken wand in his hand, prepared to meet a valiant death. The creature lowered its fearsome head to swallow Sir Cadogan and the pony whole, but the splintered and misfiring wand pierced its tongue, igniting the gassy fumes rising from its stomach and causing the wyvern to explode.

Elderly witches and wizards still use the saying ‘I’ll take Cadogan’s pony’ to mean, ‘I’ll salvage the best I can from a tricky situation’.

Sir Cadogan’s portrait, which hangs on the seventh floor of Hogwarts Castle, shows him with the pony he rode forever more (which, understandably perhaps, never much liked him) and accurately depicts his hot temper, his love of a foolhardy challenge and his determination to beat the enemy, come what may.

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Hogwarts is teeming with secrets. It seems from Harry’s explorations that every locked door and empty classroom conceals a rare magical object or fearsome monster of some kind. Let’s start with one of the most tempting but potentially devastating objects hidden in the grounds: the Mirror of Erised.

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MIRROR OF ERISED
BY J.K. ROWLING

The Mirror of Erised is a very old device. Nobody knows who created it, or how it came to be at Hogwarts School. A succession of teachers have brought back interesting artefacts from their travels, so it might have arrived at the castle in this casual manner, either because the teacher knew how it worked and was intrigued by it, or because they did not understand it and wished to ask their colleagues’ opinions.

The Mirror of Erised is one of those magical artefacts that seems to have been created in a spirit of fun (whether innocent or malevolent is a matter of opinion), because while it is much more revealing than a normal mirror, it is interesting rather than useful. Only after Professor Dumbledore makes key modifications to the mirror (which has been languishing in the Room of Requirement for a century or so before he brings it out and puts it to work) does it become a superb hiding place, and the final test for the impure of heart.

The mirror’s inscription (‘erised stra ehru oyt ube cafru oyt on wohsi’) must be read backwards to show its true purpose.

Albus Dumbledore, who brings it out of hiding, puts it back where he found it when it has achieved his purpose in Philosopher’s Stone. We must conclude, therefore, that the mirror was destroyed, along with all the other contents of the Room of Requirement, during the Battle of Hogwarts.

J.K. Rowling’s thoughts

Albus Dumbledore’s words of caution to Harry when discussing the Mirror of Erised express my own views. The advice to ‘hold on to your dreams’ is all well and good, but there comes a point when holding on to your dreams becomes unhelpful and even unhealthy. Dumbledore knows that life can pass you by while you are clinging on to a wish that can never be – or ought never to be – fulfilled. Harry’s deepest yearning is for something impossible: the return of his parents. Desperately sad though it is that he has been deprived of his family, Dumbledore knows that to sit gazing on a vision of what he can never have, will only damage Harry. The mirror is bewitching and tantalising, but it does not necessarily bring happiness.

Dumbledore may have concealed what he truly saw when looking in the Mirror of Erised, but the Headmaster didn’t hide all of his memories. Over the years, the powerful Pensieve in the Headmaster’s office was used to let Harry explore Tom Riddle’s mysterious past, the Crouch family’s terrible history, and Slughorn’s greatest mistake. Like many items in the Headmaster’s office, a Pensieve is hard to come by and tricky to use.

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‌PENSIEVE
BY J.K. ROWLING

A Pensieve is a wide and shallow dish made of metal or stone, often elaborately decorated or inlaid with precious stones, and carrying powerful and complex enchantments. Pensieves are rare, because only the most advanced wizards ever use them, and because the majority of wizardkind is afraid of doing so.

The perceived dangers of the Pensieve relate to its power over memory or thought. The Pensieve is enchanted to recreate memories so that they become re-liveable, taking every detail stored in the subconscious and recreating it faithfully, so that either the owner, or (and herein lies the danger) a second party, is able to enter the memories and move around within them. Inevitably, those with things to hide, those ashamed of their pasts, those eager to keep hold of their secrets, or protective of their privacy, will be wary of an object like the Pensieve.

Even more difficult than the recreation of memories is the use of a Pensieve to examine and sort thoughts and ideas, and very few wizards have the ability to do so. Albus Dumbledore is seen using the Hogwarts Pensieve in this way, notably in Chapter Thirty of Harry Potter and the Goblet of Fire, when he adds thoughts to the Pensieve and Harry’s face turns into Snape’s; Dumbledore is reminding himself of the hidden connection between Snape and Harry (that Snape was in love with Harry’s mother, and is now – though immensely grudgingly – honour-bound to protect him).

Traditionally, a witch or wizard’s Pensieve, like their wand, is buried with them, as it is considered an intensely personal artefact; any thoughts or memories left inside the Pensieve are likewise interred with their owner, unless he or she has requested otherwise. The Hogwarts Pensieve, however, belongs not to any individual but to the school. It has been used by a long line of headmasters and headmistresses, who have also left behind their life experience in the form of memories. This forms an invaluable library of reference for the headmaster or headmistress of the day.

The Hogwarts Pensieve is made of ornately carved stone and is engraved with modified Saxon runes, which mark it as an artefact of immense antiquity that pre-dates the creation of the school. One (unsubstantiated) legend says that the founders discovered the Pensieve half-buried in the ground on the very spot where they decided to erect their school.

The name ‘Pensieve’ is a homonym of ‘pensive’, meaning deeply, seriously thoughtful; but it also a pun, the ‘sieve’ part of the word alluding to the object’s function of sorting meanings from a mass of thoughts or memories.

If you wanted to explore the castle forever and ever, you’d need to get hold of the Philosopher’s Stone. Before it was destroyed, obviously. But did you know that the stone has a history outside the wizarding world?

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THE PHILOSOPHER’S STONE

J.K. Rowling’s thoughts

I did not invent the concept of the Philosopher’s Stone, which is a legendary substance that was once believed to be real, and the true goal of alchemy.

The properties of ‘my’ Philosopher’s Stone conform to most of the attributes the ancients ascribed to it. The Stone was believed to turn base metals into gold, and also to produce the Elixir of Life, which could make you immortal. ‘Genuine’ alchemists – the forerunners of chemists and physicists – such as Sir Isaac Newton and (the real) Nicolas Flamel, sought, sometimes over lifetimes, to discover the secret of its creation.

The Stone is variously described as red and white in the many old texts in which it appears. These colours are important in most accounts of alchemy, and are often interpreted as having symbolic meaning.

The Philosopher’s Stone isn’t the only mysterious artefact to appear to Harry in his hour of need. The sword of Gryffindor was goblin-made and studded with rubies, and was once owned by Hogwarts founder Godric Gryffindor. It was the appearance of the sword that appeased Harry’s doubts as to whether he was a true Gryffindor or not – as Dumbledore pointed out, ‘Only a true Gryffindor could have pulled that out of the Hat, Harry.’

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THE SWORD OF GRYFFINDOR
BY J.K. ROWLING

The sword of Gryffindor was made a thousand years ago by goblins, the magical world’s most skilled metalworkers, and is therefore enchanted. Fashioned from pure silver, it is inset with rubies, the stone that represents Gryffindor in the hour-glasses that count the house points at Hogwarts. Godric Gryffindor’s name is engraved just beneath the hilt.

The sword was made to Godric Gryffindor’s specifications by Ragnuk the First, finest of the goblin silversmiths, and therefore King (in goblin culture, the ruler does not work less than the others, but more skillfully). When it was finished, Ragnuk coveted it so much that he pretended that Gryffindor had stolen it from him, and sent minions to steal it back. Gryffindor defended himself with his wand, but did not kill his attackers. Instead he sent them back to their king bewitched, to deliver the threat that if he ever tried to steal from Gryffindor again, Gryffindor would unsheathe the sword against them all.

The goblin king took the threat seriously and left Gryffindor in possession of his rightful property, but remained resentful until he died. This was the foundation for the false legend of Gryffindor’s theft that persists, in some sections of the goblin community, to this day.

The question of why a wizard would need a sword, though often asked, is easily answered. In the days before the International Statute of Secrecy, when wizards mingled freely with Muggles, they would use swords to defend themselves just as often as wands. Indeed, it was considered unsporting to use a wand against a Muggle sword (which is not to say it was never done). Many gifted wizards were also accomplished duellists in the conventional sense, Gryffindor among them.

Much like a magic wand, the sword of Gryffindor appears to be almost sentient, responding to appeals for help by Gryffindor’s chosen successors; and, similar to a wand, part of its magic is that it imbibes that which strengthens it, which can then be used against enemies.

J.K. Rowling’s thoughts

There have been many enchanted swords in folklore. The Sword of Nuadu, part of the four legendary treasures of Tuatha Dé Danann, was invincible when drawn. Gryffindor’s sword owes something to the legend of Excalibur, the sword of King Arthur, which in some legends must be drawn from a stone by the rightful king. The idea of fitness to carry the sword is echoed in the sword of Gryffindor’s return to worthy members of its true owner’s house.

There is a further allusion to Excalibur emerging from the lake when Harry must dive into a frozen forest pool to retrieve the sword in Deathly Hallows (though the location of the sword was really due to a spiteful impulse of Snape’s to place it there), for in other versions of the legend, Excalibur was given to Arthur by the Lady of the Lake, and was returned to the lake when he died.

Within the magical world, physical possession is not necessarily a guarantee of ownership. This concept applies to the three Deathly Hallows, and also to Gryffindor’s sword.

I am interested in what happens when cultural beliefs collide. In the Harry Potter books, the most militant of the goblin race consider all goblin-made objects to be theirs by right, although a specific object might be made over to a wizard for his lifespan upon a payment of gold. Witches and wizards, like Muggles, believe that once payment has been made, the object belongs to them and their descendants or legatees in perpetuity. This is a clash of values without a solution, because each side has a different concept of what is right. It therefore presents Harry with a difficult moral dilemma when Griphook demands the sword as payment for his services in Deathly Hallows.

Perhaps Hogwarts’ most enduring and sinister enigma is that of the Chamber of Secrets, a hidden area of the school created by the ambitious Hogwarts founder Salazar Slytherin. When Tom Riddle’s mysterious diary led Harry to discover the Chamber’s dark secrets in his second year, the legend was awakened once again. Although few have actually entered the subterranean chamber, its existence wasn’t kept entirely secret – after all, somebody had to adapt the hidden entrance once the school decided to build a bathroom on top of it.

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THE CHAMBER OF SECRETS
BY J.K. ROWLING

The subterranean Chamber of Secrets was created by Salazar Slytherin without the knowledge of his three fellow founders of Hogwarts. The Chamber was, for many centuries, believed to be a myth; however, the fact that rumours of its existence persisted for so long reveals that Slytherin spoke of its creation and that others believed him, or else had been permitted, by him, to enter.

There is no doubt that each of the four founders sought to stamp their own mark upon the school of witchcraft and wizardry that they intended would be the finest in the world. It was agreed that each would construct their own houses, for example, choosing the location of common rooms and dormitories. However, only Slytherin went further, and built what was in effect a personal, secret headquarters within the school, accessible only by himself or by those he allowed to enter.

Perhaps, when he first constructed the Chamber, Slytherin wanted no more than a place in which to instruct his students in spells of which the other three founders may have disapproved (disagreements sprung up early around the teaching of the Dark Arts). However, it is clear by the very decoration of the Chamber that by the time Slytherin finished it he had developed grandiose ideas of his own importance to the school. No other founder left behind them a gigantic statue of themselves or draped the school in emblems of their own personal powers (the snakes carved around the Chamber of Secrets being a reference to Slytherin’s powers as a Parselmouth).

What is certain is that by the time Slytherin was forced out of the school by the other three founders, he had decided that henceforth, the Chamber he had built would be the lair of a monster that he alone – or his descendants – would be able to control: a Basilisk. Moreover, only a Parselmouth would be able to enter the Chamber. This, he knew, would keep out all three founders and every other member of staff.

The existence of the Chamber was known to Slytherin’s descendants and those with whom they chose to share the information. Thus the rumour stayed alive through the centuries.

There is clear evidence that the Chamber was opened more than once between the death of Slytherin and the entrance of Tom Riddle in the twentieth century. When first created, the Chamber was accessed through a concealed trapdoor and a series of magical tunnels. However, when Hogwarts’ plumbing became more elaborate in the eighteenth century (this was a rare instance of wizards copying Muggles, because hitherto they simply relieved themselves wherever they stood, and vanished the evidence), the entrance to the Chamber was threatened, being located on the site of a proposed bathroom. The presence in school at the time of a student called Corvinus Gaunt – direct descendant of Slytherin, and antecedent of Tom Riddle – explains how the simple trapdoor was secretly protected, so that those who knew how could still access the entrance to the Chamber even after newfangled plumbing had been placed on top of it.

Whispers that a monster lived in the depths of the castle were also prevalent for centuries. Again, this is because those who could hear and speak to it were not always as discreet as they might have been: the Gaunt family could not resist boasting of their knowledge. As nobody else could hear the creature sliding beneath floorboards or, latterly, through the plumbing, they did not have many believers, and none, until Riddle, dared unleash the monster on the castle.

Successive headmasters and mistresses, not to mention a number of historians, searched the castle thoroughly many times over the centuries, each time concluding that the Chamber was a myth. The reason for their failure was simple: none of them was a Parselmouth.

So there you have it: it’s not a guided tour, nor is it entirely complete, but you’re now privy to some of the famous wizarding school’s many secrets. We leave you with these small pieces of advice: tread carefully when using a Time-Turner, stop searching for the Chamber of Secrets – unless you’re a Parselmouth – and don’t linger too long before the Mirror of Erised.

We hope you’ve enjoyed this collection of J.K. Rowling’s writing, presented by Pottermore.

Digital Editions also published by Pottermore

Harry Potter and the Philosopher’s Stone

Harry Potter and the Chamber of Secrets

Harry Potter and the Prisoner of Azkaban

Harry Potter and the Goblet of Fire

Harry Potter and the Order of the Phoenix

Harry Potter and the Half-Blood Prince

Harry Potter and the Deathly Hallows

Harry Potter and the Cursed Child Parts One and Two

Based on an original new story by J.K. Rowling, John Tiffany and Jack Thorne
A new play by Jack Thorne

Short Stories from Hogwarts of Heroism, Hardship and Dangerous Hobbies

Short Stories from Hogwarts of Power, Politics and Pesky Poltergeists

Hogwarts: An Incomplete and Unreliable Guide

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