Ptolemaeus of Ascalon, of uncertain date, is said by Steph. Byz. to have been a pupil of *Aristarchus (2), and in the Suda to have been father (or teacher) of Archibius (a grammarian at Rome under Trajan). Ptolemaeus joined the Pergamenes (see crates(3)) and disputed the Aristarchan texts of Homer. He also wrote Περὶ διαφορᾶς λέξεων, Περὶ ὀρθογραφίας, and Περὶ μέτρων (‘on distinctions between words’; ‘on orthography’; ‘on metre’).