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(ā`jĭs), name of four Spartan kings.

Agis I, fl. late 10th cent. B.C., was the traditional founder of the Agiad dynasty, one of the two ruling dynasties of Sparta, which had a dual kingship. The other dynasty, the Eurypontids, fathered the succeeding Agises.

Agis II, d. 398? B.C., acceded to the throne on the death (c.427) of his father, Archidamus II. Agis led Spartan forces at the battle of MantineaMantinea
, city of ancient Greece, in E central Arcadia (now Arkadhía). In the Peloponnesian War a coalition led by Mantinea and Argos and urged on by Athens was defeated (418 B.C.) by Sparta at Mantinea.
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 (418 B.C.) during the Peloponnesian WarPeloponnesian War
, 431–404 B.C., decisive struggle in ancient Greece between Athens and Sparta. It ruined Athens, at least for a time. The rivalry between Athens' maritime domain and Sparta's land empire was of long standing. Athens under Pericles (from 445 B.C.
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. Advised by AlcibiadesAlcibiades
, c.450–404 B.C., Athenian statesman and general. Of the family of Alcmaeonidae, he was a ward of Pericles and was for many years a devoted attendant of Socrates. He turned to politics after the Peace of Nicias (421 B.C.
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, who had fled to Sparta to avoid trial at home, he quickly invaded Attica and established a post there. Later he quarreled with his adviser. Agis aided Lysander in the final Spartan victories of the war.

Agis III, d. 331 B.C., succeeded his father Archidamus III in 338. He led a revolt of Peloponnesian cities against Alexander the Great, who was in Asia. The rebels were crushed, and Agis was killed at Megalopolis. His death ended Greek revolts against Alexander.

Agis IV, d. c.240 B.C., son of Eudamidas II, succeeded his father c.244 B.C. He tried to revitalize Sparta by reform and by returning to the constitution of Lycurgus. His efforts failed, and he was murdered.

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