Aethlius (Greek: ) was, in Greek mythology, the first king of Elis,[1] father of Endymion.[2] He was the son of either Zeus and Protogeneia (daughter of Deucalion),[3][4] and was married to Calyce. According to some accounts, Endymion was himself a son of Zeus and first king of Elis.[5] Other traditions again made Aethlius a son of Aeolus, who was called by the name of Zeus.[6]