Niccolo Machiavelli
From Tardis Wiki, the free Doctor Who reference
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)
Machiavelli acted as an adviser to Parallaxia div Procyon during the City of the Saved Civil War. (PROSE: Interlude from a Civil War)
Behind the scenes
Machiavelli has been played by Sam Dastor and Julian Bleach in unrelated television series about the Borgias.