Helena Ravenclaw – Harry Potter Lexicon

More commonly known as “The Grey Lady,” the Ravenclaw ghost. Harry and Ron first encounter this tall ghost as she glided past in the corridor while out looking for the Mirror of Erised (PS12). Harry eventually discovers that The Grey Lady is Helena, the daughter of Hogwarts founder Rowena Ravenclaw. Helena stole her mother’s diadem […]

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Helena Ravenclaw, Harry Potter Wiki

Do Harry Potter books describe cases in which some Ravenclaws have to sleep on the corridors or in Hogwarts' Great Hall? - Quora

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In Harry Potter, what happened to the Bloody Baron? What's his story, other than being connected to the Grey Lady? - Quora

Helena Ravenclaw – Harry Potter Lexicon