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Professor Dilys Derwent was a witch, who worked as a Healer at St. Mungo's Hospital for Magical Maladies and Injuries (1722-1741), and was a celebrated Headmistress of Hogwarts School of Witchcraft and Wizardry (1741-1768). Her portrait hangs not only in Dumbledore's Office along with the portraits of previous headmasters and headmistresses, but also in St. Mungo's Hospital for Magical Maladies and Injuries' main admitting area

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