Ravenclaw is one of four houses of the Hogwarts College of Magic and Sorcery, founded by Rowena Ravenclaw, who had a daughter, whose ghost is the Gray Lady, who was murdered by the Blood Baron. His daughter stole his diadem and went to the forests of Albania, where he was assassinated, and where years later Lord Voldemort finds the diadem and hides it in the room, the Hogwarts School of Magic and Witchcraft, it is said which was Ravenclaw who gave the name to the castle.