son of the preceding, whom he succeeded on the throne in B. C. 302. He is said to have added largely to the dominions inherited from his father, by the acquisition of great part of Cappadocia and Paphlagonia, but whether by conquest or by the cession of the Macedonian rulers of Asia does not appear. (Diod. 20.111.) In B. C. 281 we find him concluding an alliance with the Heracleans, to protect them against Seleucus (Memnon, 100.11, ed. Orell.); and at a subsequent period, availing himself of the services of the Gauls, then lately settled in Asia, to overthrow a force sent against him by Ptolemy, king of Egypt. (Steph. Byz. v. Ἄγκυρα.) These are the only events recorded of his reign, which lasted thirty-six years. He was succeeded by his son Ariobarzanes III.