Amphiaraus reluctantly agreed to join the doomed undertaking, but aware of his wife's corruption, asked his sons, Alcmaeon and Amphilochus to avenge his inevitably coming death by killing her, should he not return.
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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.
In shrines dedicated to Amphiaraus, models representing babies wrapped in swaddling clothes have been excavated.
Dying Amphiaraus charged his sons Alcmaeon and Amphilochus with avenging his death, and after Amphiaraus died, fulfilling the prophecy, Alcmaeon killed his mother.
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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.
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In this version of the myth, however, Argia, Polynices's wife, persuades her husband to give the necklace to Eriphyle so that Amphiaraus will join the war effort.