In Greek mythology, Cepheus (/ˈsiːfiəs, -fjuːs/; Ancient Greek: Κηφεύς Kephéus) was a king of Tegea in Arcadia. He was an Argonaut, and was, along with most of his twenty sons, killed in Heracles' war against Hippocoon, king of Sparta.[1] He was perhaps the same Cepheus who, according to the mythographer Apollodorus, participated in the Calydonian boar hunt.[2]