Amphiaraus

[8] Amphiaraus married Eriphyle, the sister of his cousin Adrastus (the grandson of Melampus' brother Bias), and by her was the father of two sons, Alcmaeon and Amphilochus.

Amphiaraus reluctantly agreed to join the doomed undertaking, but aware of his wife's corruption, asked his sons, Alcmaeon and Amphilochus, to avenge his inevitable death by killing her, should he not return.

(This scene, as rendered by Statius, provided the model for Dante's own seminal account of Ugolino gnawing on Ruggieri's skull in Cantos XXXII and XXXIII of the Inferno.)

At some point, while the allies of Polyneices sat down to feast, an eagle swooped down and grabbed Amphiaraus's spear, taking it to a great height and then letting it drop on the earth.

He was pursued by the Erinyes as he fled across Greece, eventually landing at the court of King Phegeus, who gave him his daughter Alphesiboea in marriage.

Exhausted, Alcmaeon asked an oracle how to avoid the Erinyes and was told that he needed to stop where the sun was not shining when he killed his mother.

Achelous himself, god of that river, promised him his daughter, Callirrhoe in marriage if Alcmaeon would retrieve the necklace and clothes which Eriphyle wore when she persuaded Amphiaraus to take part in the battle.

After making a sacrifice of a few coins, or sometimes a ram, at the temple, a petitioner slept inside[23] and received a dream detailing the solution to the problem.

The symbolism of this may be due to Pyrrho being a member of the Clytidae, a clan of seers in Elis who interpreted the oracles of the Temple of Zeus at Olympia.