'Against Apion' is a polemical work, written by the renowned Jewish historian Flavius Josephus. He sought to make a defense of Judaism as a classical religion and philosophy against criticism by the Greek grammarian Apion, stressing its antiquity against what he perceived as more recent traditions of the Greeks. One of his main sources was Menander of Ephesus. It cites Josephus' earlier work Antiquities of the Jews, so can be dated after C.E. 94. It was most likely written in the early second century.