son of Pelias, king of Iolcus, was one of the Argonauts, and took part in the hunt of the Calydonian boar. His sisters, at the instigation of Medea, cut their father to pieces and boiled him in a cauldron, expecting to see him restored to them in the bloom of youth. The sorceress having failed in her promise, Acastus drove her and Jason out of Iolcus, buried his father, and instituted games to his memory. Peleus, after having been purified by Acastus from the murder of Eurystheus, appeared at these games, where he contended with Atalanta. Astydamia, or Hippolyte, the wife of Acastus, falling in love with this hero, and finding him proof against her solicitations, accused him to her husband of having made an attempt on her virtue. Acastus, unwilling to slay his guest, took his revenge by depriving him of his sword while he slept, after the fatigues of the chase, on Mount Pelion. Peleus on awakening missed his sword, and found himself in imminent danger of destruction by the hands of the Centaurs, but was rescued by the timely intervention of Chiron, who restored to him his sword. Returning, he slew both Acastus and his wife, and took possession of Iolcus. (Apollod. i. 9, iii. 13.)