Caesar

Caesar was originally a family name in ancient Rome. (AUDIO: 100 BC) After the death of Julius Caesar it became a title held by the ruler of the Roman Empire. Nero, (TV: The Romans), Augustus and Tiberius were Caesars.

The Sixth Doctor and Evelyn Smythe met Julius Caesar's parents, Gaius Julius Caesar the Elder and Aurelia, in 101 and 100 BC. (AUDIO: 100 BC)

Jesus Christ was executed in the twenty-first year of Tiberius' reign. (PROSE: Byzantium!)

The Tenth Doctor once offered to take Rose Tyler to see Caesar crossing the Rubicon. (TV: Tooth and Claw)

Thanks to River Song's hallucinogenic lipstick, the Auton Romans believed that the Doctor was Juliuis Caesar. (TV: The Pandorica Opens)

Alternate timeline
In an alternate timeline, Caesar was a title held by Holy Roman Emperor Winston Churchill. (TV: The Wedding of River Song)