224 BC, Antigonus advanced into the Peloponnese with an army of 30,000 men and forced Cleomenes to retreat to Laconia, the Spartan heartland. In 222 BC, the Macedonian-Achaean army and the Spartan army clashed at the Battle of Sellasia which ended in an allied victory. This victory forced Cleomenes to flee from Greece and go to Egypt. Antigonus took Sparta, making him the first foreigner to ever capture Sparta. Notes References Primary sources Plutarch, translated by Richard Talbert, (1988). Life of Cleomenes. New York: Penguin Classics. . Polybius, translated by Frank W. Walbank, (1979). The Rise of the Roman Empire. New York: Penguin Classics. . Secondary sources Peter Green, (1990). Alexander to Actium: The Historical Evolution of the Hellenistic Age. Los Angeles: University of California Press. . Dyme Dyme 226 BC Ancient Achaea Dyme