2. Brother of Dareius III. Codomannus. He was distinguished for his bravery, and in the battle of Issus, B. C. 333, took a prominent part in the combat in defence of the king, when attacked by the Macedonian cavalry under Alexander himself. (Diod. 17.34; Curt. 3.11.8.) He afterwards accompanied Dareius on his flight into Bactria, and fell into the hands of Alexander during the pursuit, but was treated with the utmost distinction by the conqueror, who even assigned him an honourable post about his own person; and subsequently devolved upon him the task of punishing Bessus for the murder of Dareius. (Diod. 17.77; Curt. 6.2. §§ 9, 11, 7.5.40 ; Plut. Alex. 43.) He was the father of AMASTRIS queen of Heracleia. (Memnon, 100.4. ed. Orell. ; Arr. Anab. 7.4.7; Strab. xii. p.544; Steph. Byz. s. v. αμαστρλς.)