Amphion, in Greek mythology, a son of Zeus and Antiope, the wife of Lycus, king of Thebes. He and his brother Zethus were exposed on Mount Cithaeron, but were found and brought up by shepherds. Mercury, or according to others Apollo or the muses, gave a lyre to Amphion, who from that moment devoted himself altogether to song and music. To avenge the wrongs of their mother, the brothers undertook an expedition against Thebes, which they captured and fortified, slaying both Lycus and his new wife Dirce. They then built a wall around the town, Amphion playing on his lyre, and the stones moving in obedience to its notes whither they were wanted till it was finished. Amphion married Niobe, by whom he had many sons and daughters, all of whom were killed by Apollo.