11. An illegitimate son of Ptolemy Philadelphus, king of Egypt, who was appointed by his father to command at Ephesus, when that important city fell into his hands during the war with Antiochus II. Ptolemy was subsequently induced to revolt from his father, in conjunction with Timarchus, tyrant of Miletus, and attempted to establish his own power at Ephesus, but was compelled by a mutiny of his Thracian mercenaries to take refuge in the temple of Diana, where he was slain together with his mistress Eirene. (Trog. Pomp. Prol. xxvi..; Athen. 13.593a.; Niebuhr, Niebuhr. Kl Schrift. p. 268-271.)