A lost crown that once belonged to Helena Ravenclaw. Her daughter, the Grey Lady, stole it and took it to Albania where is was considered lost. Lord Voldemort discovered it, turned it into a Horcrux...
Harry Potter finds the Lost Diadem of Rowena Ravenclaw in the Room of Requirement after thinking "I need the place where everything is hidden." It was perched atop "a stone bust of an old man wearing...
Its like a crown or a tiara inscribed with the words "Wit, beyond measure, is man's greatest treasure." Rowena Ravenclaw used to own this when she was alive. It it one of the horcruxes. It is...
Crabbe (one of Draco's friends) starts fiendfyre (cursed fire) in the Room of Requirement. He is trying to kill Harry, Ron, and Hermione. However, the fire gets out of control and consumes the room,...