In Deathly Hallows: Part 2?
As seen in this clip, when Harry has the vision of a woman standing by a Ravenclaw banner, he actually sees Rowena Ravenclaw. The article states that she is "Mentioned only". Also, as the only Founder ever pictured in the films, do we know what actress played her? -- Seth Cooper owl post! 14:42, July 25, 2011 (UTC)
I saw the film today. When I compare the vision of Rowena Ravenclaw to the ghost of Helena Ravenclaw, there is a great similarity between them, so there is a great possibility that the same actress - Kelly Macdonald - has played both roles.
Otherwise maybe Harry was mistaken, when he thought, he would have seen Rowena Ravenclaw, perhaps he saw in reality Helena Ravenclaw. Tom Riddle had spoken in the past to Helena, not to Rowena.
But that is only my opinion and not a proof. Harry granger 21:46, July 31, 2011 (UTC)