Agis II (d. c. 401 BC) was the 17th Eurypontid king of Sparta, the eldest son of Archidamus II by his first wife, and half brother of Agesilaus. He ruled with his Agiad co-monarch Pausanius. Agis succeeded his father Archidamus in 427 BC, and reigned a little more than 28 years. In the summer of 426 BC, he led an army of Peloponnesians and their allies as far as the isthmus, with the intention of invading Attica; but they were deterred from advancing farther by a succession of earthquakes which ...