Flavius Josephus fully defected to the Roman side and was granted Roman citizenship. He became an advisor and friend of Vespasian's son Titus, serving as his translator when Titus led the Siege of Jerusalem, which resulted—when the Jewish revolt did not surrender—in the city's destruction and the looting and destruction of Herod's Temple (Second Temple).
Josephus recorded Jewish history, with special emphasis on the first century AD and the First Jewish–Roman War, including the Siege of Masada, but the imperial patronage of his work has sometimes caused it to be characterized as pro-Roman propaganda
That would make him a catholic?