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 known 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)

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