The Hellenism of the sixth and fifth centuries was to a great extent what the Hellenism of later ages was almost entirely, an ideal and a standard of culture. The classical Greeks were not, strictly speaking, pure Hellenes by blood. Herodotus, and Thucydides[41:1] are quite clear about that. The original Hellenes were a particular conquering tribe of great prestige, which attracted the surrounding tribes to follow it, imitate it, and call themselves by its name. The Spartans were, to Herodotus, Hellenic; the Athenians on the other hand were not. They were Pelasgian, but by a certain time 'changed into Hellenes and learnt the language'. In historical times we cannot really find any tribe of pure Hellenes in existence, though the name clings faintly to a particular district, not otherwise important, in South Thessaly. Had there been any undoubted Hellenes with incontrovertible pedigrees still going, very likely the ideal would have taken quite a different name. But where no one's ancestry would bear much inspection, the only way to show you were a true Hellene was to behave as such: that is, to approximate to some constantly rising ideal of what the true Hellene should be. In all probability if a Greek of the fifth century, like Aeschylus or even Pindar, had met a group of the real Hellenes or Achaioi of the Migrations, he would have set them down as so many obvious and flaming barbarians. We do not know whether the old Hellenes had any general word to denote the surrounding peoples ('Pelasgians and divers other barbarous tribes'[42:1]) whom they conquered or accepted as allies.[42:2] In any case by the time of the Persian Wars (say 500 B. C.) all these tribes together considered themselves Hellenized, bore the name of 'Hellenes', and formed a kind of unity against hordes of 'barbaroi' surrounding them on every side and threatening them especially from the east. Let us consider for a moment the dates. In political history this self-realization of the Greek tribes as Hellenes against barbarians seems to have been first felt in the Ionian settlements on the coast of Asia Minor, where the 'sons of Javan' (Yawan = Ἰάων) clashed as invaders against the native Hittite and Semite. It was emphasized by a similar clash in the further colonies in Pontus and in the West. If we wish for a central moment as representing this self-realization of Greece, I should be inclined to find it in the reign of Pisistratus (560-527 B. C.) when that monarch made, as it were, the first sketch of an Athenian empire based on alliances and took over to Athens the leadership of the Ionian race.