Antigonus III Doson

After Demetrius II's death, Antigonus III Doson became regent for the infant Philip V. He effectively ruled Macedon, stabilizing the kingdom after the defeat and death of his predecessor.

Antigonus III Doson led a coalition of Greek states to defeat the Spartan king Cleomenes III at Sellasia. This victory ended the Cleomenean War, restored Macedonian hegemony over the Peloponnese, and forced Sparta into submission.

Antigonus III Doson died suddenly from an illness, possibly tuberculosis, while campaigning against the Illyrians. His death ended a successful regency and left the throne to the young Philip V, who would later challenge Rome.