Alexander IV - ΒΑΣΙΛΕΩΣ of Macedon from 323 BC to 310 BC
Alexander IV was the son of Alexander the Great (Alexander III) and Princess Roxana of Bactria.

Because Roxana was pregnant when her husband died and the sex of the baby was unknown, there was dissension in the army regarding the order of succession. The infantry supported Philip III, and the elite cavalry supported waiting in the hope that Roxana's unborn child would be male.

A compromise was reached where Philip III would rule as a figurehead, with real power residing with regents, until Alexander IV reached adulthood.

When Alexander IV was around 13 or 14, he was supposed to reign in his own name and excercise full power. The regent at the time, Kassander, responded by assassinating the 14-year-old Alexander IV and his mother.
Alexander IV
King Alexander IV of Macedonia

(1) Alexander IV 322-320 BC
Obverse: Head of Herakles right, wearing lion skin headdress.
Reverse: Zeus Aetophoros seated left, holding eagle and sceptre; Phrygian cap before, BAΣIΛEΩΣ to left, ΑΛΕΞΑΝΔΡΟΥ to right.
Ref: Price 112; Troxell, Studies, Issue ...