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.
Chrysaor, married to Callirrhoe, daughter of glorious Oceanus, was father to the triple-headed Geryon, but Geryon was killed by the great strength of Heracles at sea-circled Erytheis beside his own shambling cattle on that day when Heracles drove those broad-faced cattle toward holy Tiryns, when he crossed the stream of Okeanos and had killed Orthos and the oxherd Eurytion out in the gloomy meadow beyond fabulous Oceanos.
Achelous, the god of that river, offered him his daughter Callirrhoe in marriage if Alcmaeon would retrieve the necklace and clothes that Eriphyle had worn when she persuaded Amphiaraus to take part in the battle.
It is identified with the ruins of Zara, near the mouth of the Wady Zerka Main, on the eastern shore of the Dead Sea, some 3 miles south of the Callirrhoe, in the territory of the Tribe of Reuben.