Amphiaraus was a king of Argos in Greek mythology, who reigned alongside Iphis and Adrastus, brother of his wife Eriphyle. He was the son of Oecles and Hypermnestra. He participated in the hunt of the Calydonian Boar, and he was also an oracle.
He was one of the main characters in the myth of the Seven Against Thebes. His wife Eriphyle was bribed by Polynices with the necklace of Harmonia, and she managed to convince her husband to participate in the war, although it was doomed to fail. Although he accepted, Amphiaraus was aware of his wife’s ploy and asked his children Alcmaeon and Amphilochus to kill their mother if he was slain in the battlefield. During the battle, he killed Melanippus, but he was attacked by Periclymenus, son of Poseidon. Trying to flee, Amphiaraus was swallowed by the earth when Zeus threw a thunderbolt and split it in half. Afterwards, Alcmaeon killed his mother as he had promised his father, but was pursued by the Erinyes for committing matricide.