After his father's death in 359 BC he became king, but he was only a child. His uncle, Philip II of Macedon, who was Perdiccas' brother, became his tutor and regent. In that same year, Philip declared himself king of Macedonia, expropriating his young nephew.
Amyntas was not judged as dangerous enough to be a menace to Philip, who even gave him his daughter Cynane in marriage. The succession of Amyntas' cousin Alexander in 336 BC changed things — Alexander immediately had Amyntas executed.
^Carney, Elizabeth; Ogden, Daniel (2010). Philip II and Alexander the Great : father and son, lives and afterlives (1 ed.). USA: Oxford University Press. p. 38. ISBN978-0199738151.
^Leon, Vicki. (1995) Uppity Women of Ancient Times. Publishers Group West. Page 182-183. ISBN1-57324-010-9