Cleisthenes (; Greek, Ancient (to 1453);: Κλεισθένης), also Clisthenes or Kleisthenes, was a prominent Athenian delegate (theoros) during the Peloponnesian War (431 BC). The comedian Aristophanes used him frequently as the butt of jokes and as a character in his plays, ridiculing him for being effeminate and/or homosexual. He is notably mentioned in The Frogs, The Clouds, Lysistrata, and Thesmophoriazusae.