Antigonus III Doson
In quick succession, Cleomenes cleared the cities of Arcadia of their Achaean garrisons, before crushing another Achaean force at Dyme. Facing Spartan domination, Aratus was forced to turn to Antigonus III Doson ( 229–221 BC) of Macedon. In return for Macedonian assistance, the Achaeans were obliged to surrender the citadel overlooking Corinth to Antigonus. Cleomenes eventually invaded Achaea, seizing control of Corinth and Argos, but was forced to retreat to Laconia when Antigonus arrived in the Peloponnese. Cleomenes fought the Achaeans and the Macedonians at Sellasia, where the Spartans were routed. He then fled to the court of his ally, Ptolemy III of Egypt ( 246–222 BC), where he ultimately committed suicide in the wake of a failed revolt against the new Pharaoh, Ptolemy IV ( 221–205 BC).