Alcmaeon (ălkmē`ən), in Greek legend, son of Amphiaraüs and Eriphyle, a leader of the expedition of the Epigoni Epigoni (ēpĭg`ənī), in Greek legend, the sons of the Seven against Thebes , who avenged the death of their fathers.
..... Click the link for more information. against Thebes. He murdered his mother in revenge for his father's death and consequently was haunted by the Erinyes until he found haven on Achelous' island. There he married Callirrhoë, daughter of Achelous, and lived in peace until his wife demanded the sacred robe and necklace of Harmonia, which were in the possession of his former wife Arsinoë. When he tried to regain them from Arsinoë, her brothers killed him.

Alcmaeon

or Alcmeon

In Greek mythology, the son of the seer Amphiaraus. The seer had been persuaded by his wife to join the expedition of the Seven Against Thebes. On realizing that he would die, he charged Alcmaeon and his other sons with avenging his death. Alcmaeon led the sons of the seven in the destruction of Thebes and then obeyed his father's injunction to kill his mother, a crime for which the Furies drove him mad. He was purified by King Phegeus of Psophis, whose daughter he married but subsequently killed. Following the advice of an oracle, he settled on an island at the mouth of the Achelous River, where he married again, but was killed by Phegeus and his sons.