The Grey Lady is the house ghost of which Hogwarts house?

The Grey Lady is Helena Ravenclaw, daughter of Rowena Ravenclaw, the founder of Ravenclaw House. Her story is a tragic one. The short version goes like this: Helena stole her mom's beloved diadem, which is basically a tiara, and absconded to Albania (as one does). Her mother then became fatally ill, and when the baron (a.k.a., her fellow house ghost, the Bloody Baron) who had a massive crush on her tried to make her return to her mother's side with him, Helena refused and the baron killed her. Then he killed himself. Yikes.

Asked by Beth Sederstrom · Last updated 5 years ago · 138.3K views · SOURCE