In Greek mythology, Cretheus (/ˈkriːθiəs, -θjuːs/; Ancient Greek: Κρηθεύς Krētheus) may refer to the following characters: * Cretheus, king and founder of Iolcus, the son of King Aeolus of Aeolia (son of Hellen) by either Enarete or Laodice. He was the brother of Sisyphus, Athamas, Salmoneus, Deion, Magnes, Perieres, Canace, Alcyone, Peisidice, Calyce and Perimede. Cretheus's wives were Tyro, his niece, and Demodice or . With Tyro, he fathered Aeson, Pheres, and Amythaon. When Cretheus found out that Tyro had an affair with Poseidon, he left her and married Demodice. He also had several daughters, namely Hippolyte, future wife of Acastus (otherwise known as Astydameia), Myrina who married Thoas, and possibly , eponym of Phalanna. * Cretheus, also known as Cres, the Cretan father of an un