an ancient town of Laconia, in the valley of the Cenus, at the point where the roads from Sparta to Argos and Tegea separate. It is only remarkable for an important battle that was fought here B.C. 221. During the war between Sparta and the Achaean League, the latter having obtained the assistance of Antigonus the Macedonian monarch, Cleomenes, king of Sparta, apprehending an invasion, took up a strong position near Sellasia with 20,000 men. His right wing, under his own command, occupied Mount Olympus, and his left, under his brother Euclidas, Mount Evas; while the whole line was defended by intrenchments. Antigonus approached from the north with a much superior force; but seeing the strength of his adversaries' position, hesitated for some days before venturing an attack. At length he assaulted with his right wing the position of Euclidas; and, favoured by an error of that general, and a timely charge of Philopoemen with the Megapolitan cavalry, gained a complete victory. Cleomenes then advanced to retrieve the day; but, after a desperate conflict, was repulsed with great loss. Antigonus thereafter captured Sparta, and Cleomenes took refuge in Egypt.