Athens: Its Rise and Fall Book I Vol I

I. We have already seen, that while the Dorians remained in Thessaly, the Achaeans possessed the greater part of the Peloponnesus. But, under the title of the Return of the Heraclidae (or the descendants of Hercules), an important and lasting revolution established the Dorians in the kingdoms of Agamemnon and Menelaus. The true nature of this revolution has only been rendered more obscure by modern ingenuity, which has abandoned the popular accounts for suppositions still more improbable and romantic. The popular accounts run thus: -- Persecuted by Eurystheus, king of Argos, the sons of Hercules, with their friends and followers, are compelled to take refuge in Attica. Assisted by the Athenians, they defeat and slay Eurystheus, and regain the Peloponnesus. A pestilence, regarded as an ominous messenger from offended heaven, drives them again into Attica. An oracle declares that they shall succeed after the third fruit by the narrow passage at sea.

Wrongly interpreting the oracle, in the third year they make for the Corinthian Isthmus. At the entrance of the Peloponnesus they are met by the assembled arms of the Achaeans, Ionians, and Arcadians. Hyllus, the eldest son of Hercules, proposes the issue of a single combat. Echemus, king of Tegea, is selected by the Peloponnesians. He meets and slays Hyllus, and the Heraclidae engage not to renew the invasion for one hundred years. Nevertheless, Cleodaeus, the son, and Aristomachus, the grandson, of Hyllus, successively attempt to renew the enterprise, and in vain. The three sons of Aristomachus (Aristodemus, Temenus, and Cresphontes), receive from Apollo himself the rightful interpretation of the oracle. It was by the Straits of Rhium, across a channel which rendered the distance between the opposing shores only five stadia, that they were ordained to pass; and by the Return of the third fruit, the third generation was denoted.