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BATTLE // -221 BCE

Battle of Sellasia

Overview

The Battle of Sellasia took place during the summer of 222 BC between Macedon and the Achaean League, led by Antigonus III Doson, and Sparta under the command of King Cleomenes III. The battle was fought at Sellasia, on the northern frontier of Laconia and ended in a Macedonian-Achaean victory.

Overview adapted from Wikipedia, licensed under CC BY-SA 4.0.

Significance

The Battle of Sellasia, fought in the summer of 222 BC on the northern frontier of Laconia, was a decisive engagement of the Cleomenean War in which the combined Macedonian and Achaean League forces under Antigonus III Doson defeated Sparta under King Cleomenes III. Sparta's losses of approximately 5,800 against a combined Macedonian-Achaean force of around 28,000 against Sparta's 20,000 indicate the scale of the Spartan defeat. The battle ended Spartan resistance in the conflict and secured Macedonian and Achaean dominance over the Peloponnese, with the fall of Laconia's northern frontier leaving Sparta itself exposed. Cleomenes III and his co-commander Eucleidas were unable to hold the line against the larger coalition force assembled by Antigonus.

Forces & casualties

Troop strength

  • Macedon28,000
    medium
  • Sparta20,000
    medium

Macedon fielded a 1.4 : 1 numerical advantage

Casualties

  • Sparta5,800
    medium29% loss rate

Commanders (7)

Last verified July 2026
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