Cleomenes III
The seizure of numerous important Arcadian cities by the King of Sparta, Cleomenes III, prompted the dominant state of the Peloponnese, the Achaean League to declare war on Sparta. The Achaean attempts to recaptured these cities, led by the strategos, Aratus of Sicyon, largely failed as Sparta consolidated its position. Subsequent Achaean offensives in 226 BC were crushingly defeated at the Battle of Mount Lycaeum and the Battle of Ladoceia.