Estella (The Stones of Venice)

 was the wife of Orsino. She had disappeared in 2194, apparently drowning herself in the main canal in Venice, and as she did this she curse the town and Orsino. In fact she didn't disappear but stayed in Venice but went by the name of Ms Lavish. She met The Doctor and Charlotte Pollard when they arrived in Venice.

At Orsino's end of the World, she sat at the throne and it was revealed that she was Estella. The curse was a side affect of the technology of her people. On her's and Orsino's actions the curse is reversed, and Venice is saved. (AUDIO: The Stones of Venice)