(Αἰακίδης), the son of Arymbas, king of Epirus, succeeded to the throne on the death of his cousin Alexander, who was slain in Italy. (Liv. 8.24.) Aeacides married Phthia, the daughter of Menon of Pharsalus, by whom he had the celebrated Pyrrhus and two daughters, Deidameia and Troias. In B. C. 317 he assisted Polysperchon in restoring Olympias and the young Alexander, who was then only five years old, to Macedonia. In the following year he marched to the assistance of Olympias, who was hard pressed by Cassander; but the Epirots disliked the service, rose against Aeacides, and drove him from the kingdom. Pyrrhus, who was then only two years old, was with difficulty saved from destruction by some faithful servants. But becoming tired of the Macedonian rule, the Epirots recalled Aeacides in B. C. 313; Cassander immediately sent an army against him under Philip, who conquered him the same year in two battles, in the last of which he was killed. (Paus. 1.11; Diod. 19.11, 36, 74; Plut. Pyrrh. 1.2.)