Voltaire

Voltaire was a French writer and philosopher. He was expelled from the French court by Louis XV in 1758. In the Shadow-Space version of France, the Fifth Doctor was said to be a friend of Voltaire. (AUDIO: Masquerade)

The Seventh Doctor quoted Voltaire when he told Sherlock Holmes that he was a doctor of "metaphysico-theologico-cosmologo-nigology". (PROSE: All-Consuming Fire)