Cleinias, was a prominent Athenian. His father, Alcibiades, had been proxenos of Sparta, and was ostracised in 460 BC. He married Deinomache, the daughter of Megacles and a member of the important Alcmaeonid family, and had two sons, Alcibiades and Cleinias. Politically he was a supporter of Pericles, his wife's cousin. He died at the Battle of Coronea, aged around 34. After his death his children were made wards of Pericles and his brother Ariphron.