Justinian

 was the emperor of the Byzantine Empire in 540. The Monk managed to persuade him to get the Fifth Doctor arrested as a Persian spy. He was attacked by the Ostardi, which used him as a host. (AUDIO: The Secret History)

In Roma I, Justinian was crowned Emperor of Rome and India six centuries after the reign of Augustus. During his reign, Roman navigators discovered the American continent and incorporated it into the Roman Empire. (PROSE: Warlords of Utopia)