Alexander IV of Macedon

Alexander IV (Greek: Ἀλέξανδρος; August 323 BC – Late summer 309 BC), sometimes called Aegus, was the younger son of Alexander the Great (Alexander III of Macedon) by his wife Roxana of Bactria, born after his father's death. As his father's only surviving legitimate child, Alexander IV inherited the throne of the Macedonian Empire after him; however, he was murdered in his early teens, never wielding actual power.

Source: Wikipedia — https://en.wikipedia.org/wiki/Alexander_IV_of_Macedon