In the traditional genealogy of the Hellenes, Ion, the ancestor of the Ionians, is brother of Achaeus and son of Xuthus (who held Peloponnese after the dispersal of the children of Hellen).
The democratic states of the Peloponnese were driven, partly by the intrigues of Alcibiades, now anti-Laconian, into alliance with Athens, with the object of establishing a democratic Peloponnese under the leadership of Argos.
The descents on the Peloponnese were futile in the extreme.
The social and political structure of the Dorian states of Peloponnese presupposes likewise a conquest of an older highly civilized population by small bands of comparatively barbarous raiders.
The policy of Athens was mistaken for two reasons: (I) Sparta was not entirely humiliated, and (2) alliance with the land powers of Peloponnese was incalculably dangerous, inasmuch as it involved Athens in enterprises which could not awake the enthusiasm of her maritime allies.
Her interests and those of Athens did not directly clash, for Athens included in her empire only the islands of the Aegean and the towns on its north and east coasts, which lay outside the Spartan political horizon: with the Peloponnese Athens did not meddle.
The legend of a Dorian invasion appears first in Tyrtaeus, a 7thcentury poet, in the service of Sparta, who brings the Spartan Heracleids to Peloponnese from Erineon in the northern Doris; and the lost Epic of Aegimius, of about the same date, seems to have presupposed the same story.
He was educated at Constantinople, and in 1423 went to the Peloponnese to hear Gemistus Pletho expound the philosophy of Plato.
The legend of an organized apportionment of Peloponnese amongst the Heracleid leaders appears first in the 5th-century tragedians, - not earlier, that is, than the rise of the Peloponnesian League, - and was amplified in the 4th century; the Aetolians' aid, and claim to Elis, appear first in Ephorus.
In 220-219 the Aetolians defeated him in Arcadia and harried the Peloponnese unchecked.