People - Ancient Greece: Eucleidas Ancient Usurper Eurypontid King of Sparta, who reigned from 227 BC up until 221 BC.
Eucleidas in Wikipedia
Eucleidas reigned Sparta from 227 BC up until 221 BC. He was an Agiad, in the place of the Eurypontid king. His brother, Cleomenes III, deposed his Eurypontid colleague Archidamus V, and installed his brother as his new co-ruler. Eucleidas was killed fighting against the Macedonians at the Battle of Sellasia.