Demetrius was a Grecian Jew, who wrote, toward the close of the third century b.c., a History of Israel, based upon the Scripture records, and with especial reference to chronology. Demetrius is mentioned by Josephus (who, however, wrongly makes him a heathen; contra Apionem, I. 23), by Clement of Alexandria, and by Eusebius. His work is no longer extant, but fragments of it are preserved by Clement (Strom. I. 21) and by Eusebius (Præp. Evang. IX. 21 and 29). See Schürer, ibid. p. 730 sq.