Flaccus was a Roman appointed Viceroy of Alexandria in Egypt by the Emperor of Rome, Tiberius Caesar. He performed well but after the death of Tiberius, to whom he was very close, he became desultory in his duties, and Gaius ( the successor of Tiberius) eventually placed a death warrant on him. Flaccus was best known for his hatred of the Jews and all things Jewish, and his endeavors to do all he could to undermine and persecute them.