(Ἄγις), king of Sparta, son of Eurysthenes, began to reign, it is said, about B. C. 1032. (Müller, Dor. vol. ii. p. 511, transl.) According to Eusebius (Chron. i. p. 166) he reigned only one year; according to Apollodorus, as it appears, about 31 years. During the reign of Eurysthenes, the conquered people were admitted to an equality of political rights with the Dorians. Agis deprived them of these, and reduced them to the condition of subjects to the Spartans. The inhabitants of the town of Helos attempted to shake off the yoke, but they were subdued, and gave rise and name to the class called Helots. (Ephor. apud Strab. viii. p. 364.) To his reign was referred the colony which went to Crete under Pollis and Delphus. (Conon. Narr. 36.) From him the kings of that line were called Ἀγιδαι. His colleague was Sous. (Paus. 3.2.1.)