In the 13th century, Arithmancer Bridget Wenlock came up with a fascinating new theorem which exposed the magical properties of the number seven. The number permeates the Harry Potter septet of books, cropping up in all sorts of interesting places: we’ve laid out some of our favourites below...
Significance of Seven infographic

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Who lost the most house points at Hogwarts? Find out our handy history of Hogwarts house points.

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