Niccolo Machiavelli

Niccolo Machiavelli was a writer and politician. The First Doctor, Steven Taylor and Vicki Pallister landed inside his house in Florence, Italy in 1514. He advised the Doctor on the best way to get Steven and Vicki back after they were arrested. He later accused the Doctor of planning to kill the Pope Leo X and Guiliano de Medici. He did this to aid his plan. (AUDIO: The Ravelli Conspiracy)

By one account, Niccolo Machiavelli, Cardinal Richelieu, and Maximilien Robespierre were all pseudonyms used by Hades while living among humanity. (PROSE: Deadly Reunion)

Machiavelli acted as an adviser to Parallaxia div Procyon during the City of the Saved Civil War. (PROSE: Interlude from a Civil War)

Parallel universes
In Pete's World, Machiavelli was cited as an inspiration by John Lumic alongside Genghis Khan and Hitler as people who "got what they wanted in spite of the little people". (PROSE: Lumic)

Behind the scenes
Machiavelli has been played by Sam Dastor and Julian Bleach in unrelated television series about the Borgias.