(Ἀρχέλαος), one of the illegitimate sons of AMYNTAS II. by Cygnaea. Himself and his two brothers (Archideus or Arrhidaeus, and Menelaus) excited the jealousy of their halfbrother Philip; and, this having proved fatal to one of them, the other two tied for refuge to Olynthus. According to Justin, the protection which they obtained there gave occasion to the Olynthian war, B. C. 349; and on the capture of the city, B. C. 347, the two princes fell into Philip's hands and were put to death. (Just. 7.4, 8.3.)