Marie Antoinette

Marie Antoinette was a queen of France.

The Doctor met Marie Antoinette and acquired a hairpin from her that he used as a lockpick. (TV: Pyramids of Mars; AUDIO: Vampire of the Mind) The Fourth Doctor called her "charming", but said that she "lost her head". (TV: Pyramids of Mars)

Later references
The Fourth Doctor told Uvanov that Uvanov reminded him of Marie Antoinette. (TV: The Robots of Death)

The androids of EarthWorld mistakenly believed her to be the Queen of Scotland, having mixed her up with Mary Stuart. (PROSE: EarthWorld)

In the 51st century, the starship SS Marie Antoinette was named after her. (TV: Deep Breath)

Behind the scenes
Marie Antoinette was played by Elizabeth Berrington in the BBC sitcom Let Them Eat Cake.