Plataea, Or Plataese, an ancient city of Boe-otia, on the boundary of Attica, at the foot of Mt. Cithseron, about 7 m. S. by W. of Thebes. The Platseans claimed to derive their name from Platsea, a daughter of Asopus, and their city was one of the oldest of Greece, being mentioned by Homer. The Thebans said that they had founded the city, but in 519 B. C. Platsea, unwilling to acknowledge their supremacy, allied itself with Athens. A thousand of its citizens participated in the battle of Marathon (490). In 480 the city was burned by the Persians, and in 479 was fought the battle of Plateea. (See Greece, vol. viii., p. 190.) For the victory gained on their soil, the confederate Greeks granted the Platseans 80 talents, and charged them with the duty of paying annual honors to the tombs of the fallen warriors, and of celebrating every five years the festival of the Eleutheria; and in return the independence and inviolability of their territory were guaranteed. In 431 the Thebans. made an unsuccessful attempt to seize Plataaa; and later the city, defended by 480 men, held out against the Lacedaemonians from 429 to the summer of 427, when want of provisions compelled a surrender, after which it was razed to the ground.
It was rebuilt after the peace of Antalcidas, but was again destroyed by the Thebans in 374; was once more rebuilt by the Macedonians in 338, and is spoken of in the 6th century A. D. by Hierocles as one of the cities of Boeotia. Its ruins are still traced near the village of Kokla.