...was also a cousin of Philip, whose mother he had taken to wife. With this Antigonus then and the Achaeans Cleomenes made peace, and immediately broke all the oaths he had sworn by reducing to slavery Megalopolis , the city of the Arcadians. Because of Cleomenes and his treachery the Lacedaemonians suffered the reverse at Sellasia, where they were defeated by the Achaeans under Antigonus. In my account of Arc...