Pausanias Description of Greece 5.1.8

[8]
  Aetolus, who came to the throne after Epeius, was made to flee from Peloponnesus , because the children of Apis tried and convicted him of unintentional homicide. For Apis, the son of Jason, from Pallantium in Arcadia , was run over and killed by the chariot of Aetolus at the games held in honor of Azan. Aetolus, son of Endymion, gave to the dwellers around the Achelous their name, when he fled to this part of the mainland. But the kingdom of the Epeans fell to Eleius, the son of Eurycyda, daughter of Endymion and, believe the tale who will, of Poseidon. It was Eleius who gave the inhabitants their present name of Eleans in place of Epeans.

[8] Aitolos, who came to the throne after Epeios, was made to flee from Peloponnesus, because the children of Apis tried and convicted him of unintentional homicide. For Apis, the son of Jason, from Pallantion in Arcadia, was run over and killed by the chariot of Aitolos at the Games held in honor of Azan. Aitolos, son of Endymion, gave to the dwellers around the Akhelōos their name, when he fled to this part of the mainland. But the kingdom of the Epeians fell to Eleios, the son of Eurukuda, daughter of Endymion and, believe the tale who will, of Poseidon. It was Eleios who gave the inhabitants their present name of Eleians in place of Epeians.