Matilda (The Impossible Astronaut)

Matilda was an apparent aristocrat who once met the Eleventh Doctor. She painted a nude study of him. During the process, she was forced to hide him under her dress as she was discovered by an unnamed king. However, the king discovered the Doctor and imprisoned him in the Tower of London. (DW: The Impossible Astronaut)

Behind the scenes
Matilda is not named in the episode proper; instead the name is derived from the end credits.