In 221 BC Antiochus at last went far east, and the rebellion of Molon and Alexander collapsed which Polybios attributes in part to his following the advice of Zeuxis rather than Hermeias. The submission of Lesser Media, which had asserted its independence under Artabazanes, followed. Antiochus rid himself of Hermeias by assassination and returned to Syria (220 BC). Meanwhile, Achaeus himself had revolted and assumed the title of king in Asia Minor. Since, however, his power was not well enough grounded to allow an attack on Syria, Antiochus considered that he might leave Achaeus for the present and renew his attempt on Ptolemaic Syria.