Careful inspection of all external and internal evidence reveals that the Apology of Aristides, known since 1889 as the long-lost “earliest extant apology for the Christian Faith,” mentioned by Eusebius and Jerome, was written by a proselyte to Hellenist Judaism, probably in the time of Hadrian, not as an apology for Christians at all, but primarily as a counterattack upon polytheists and their religious notions and secondarily, as a defense of the monotheistic worship and the morals of the Jews. This definitely Jewish work of the second century was interpolated and “edited” by a Christian writer, probably of the late fourth century, and was thus converted into what passed as an apology for Christianity.