3. Grandson of Amyntas II., was left an infant in nominal possession of the throne of Macedonia, when his father Perdiccas III. fell in battle agains the Illyrians, B. C. 360. (Diod. 16.2.) He was quietly excluded from the kingly power by his uncle Philip, B. C. 359, who had at first acted merely as regent (Just. 7.5), and who felt himself so safe in his usurpation, that he brought up Amyntas at his court, and gave him one of his daughters in marriage In the first year of the reign of Alexander the Great, B. C. 336, Amyntas was executed for a plot against the king's life. (Thirlw. Gr. Hist. vol. v. pp. 165, 166, 177, vol. vi. p. 99, and the authorities to which he refers ; Just. 12.6, and Freinsheim, ad Curt. 6.9, 17.)