History of the Peloponnesian War

The best proof of this is furnished by Homer. Born long after the Trojan war, he nowhere calls all of them by that name, nor indeed any of them except the followers of Achilles from Phthiotis, who were the original Hellenes: in his poems they are called Danaans, Argives, and Achaeans. He does not even use the term barbarian, probably because the Hellenes had not yet been marked off from the rest of the world by one distinctive appellation.