Aristobulus was a well-known Hellenistic philosopher of Alexandria, who lived in the time of Ptolemy Philometor in the second century b.c. He was thoroughly acquainted with Greek philosophy, and was in many respects the forerunner of Philo. Anatolius’ statement that he wrote in the time of Ptolemy Philadelphus, and consequently his report that he was one of the seventy translators of the Septuagint (on the legend as to its composition, see Bk. V. chap. 8, note 31) must be looked upon as certainly an error (see Clement Alex Strom. I. 22, Eusebius’ Præp. Evang. IX. 6, and XIII. 12, and his Chron., year of Abr. 1841). He is mentioned often by Clement of Alexandria, by Origen (Contra Cels. IV. 51), and by Eusebius, who in his Præp. Evang. (VII. 14 and VIII. 10) gives two fragments of his work (or works) On the Mosaic Law. It is doubtless to this same work that Anatolius refers in the present passage. No other fragments of his writings are extant. See especially Schürer, Gesch. der Juden im Zeitalter Jesu Christi, II. p. 760 sq. See also Bk. VI. chap. 23, note 13, above.