He became an advisor and friend of Vespasian 's son Titus , serving as his translator when Titus led the Siege of Jerusalem .
Flavius Josephus fully defected to the Roman side and was granted Roman citizenship .
Flavius Josephus became an advisor and friend of Vespasian 's son Titus , serving as Flavius Josephus ' translator when Titus led the Siege of Jerusalem .
Flavius Josephus fully defected to the Roman side and was granted Roman citizenship .