AMPHION and ZETHUS, in Greek mythology, the twin sons of Zeus by Antiope. When children, they were exposed on Mt. Cithaeron, but were found and brought up by a shepherd. Amphion became a great singer and musician, Zethus a hunter and herdsman. After punishing Lycus and Dirce for cruel treat ment of Antiope (q.v.), they built and fortified Thebes, huge blocks of stone forming themselves into walls at the sound of Amphion's lyre. Amphion married Niobe, and killed himself after the loss of his wife and children (Ovid. Metam., vi. 27o).