Duke Humfrey's Library is the oldest reading room in the Bodleian Library at the University of Oxford. It is named after Humphrey, Duke of Gloucester, a connoisseur of literature who donated his collection of 281 books to the university at his death in 1447. Books were hand-written at the time and his legacy was considered an extraordinarily generous donation, since the university previously had only 20 books. Duke Humfrey's Library was used as the library of Hogwarts for the filming of the Harry Potter films.Photograph credit: David Iliff