Neoptolemus I, king of Epeirus, son of Alcetas I., and father of Alexander I., and of Olympias, the mother of Alexander the Great. On the death of Alcetas, Neoptolemus and his brother Arymbas or Arrybas agreed to divide the kingdom, and continued to rule their respective portions without any interruption of the harmony between them, until the death of Neoptolemus, which, according to Droysen, may be placed about 360 BC. No further incidents of his reign have been transmitted to us. (Paus. i. 11. §§ 1, 3; Justin. vii. 6. § 10, xvii. 3. § 14; Droysen, Hellenismus, vol. i. p. 250, not.)