Thessaly, again, was a loose confederacy of towns or cantons, in which certain great families, such as the Aleuadae and Scopadae, held the direction of their local affairs; or some tyrannus, as Alexander of Pherae, obtained sovereign powers. Still, for certain purposes, a connexion was acknowledged, and a Tagus of Thessaly was appointed, with the power of summoning a general levy of men. For a short time prior to the Roman conquest these officers appear to have gained additional importance; but Thessaly never was united enough to be of importance, in spite of its famous cavalry, even among Greek nations, far less to be capable of presenting a firm front to the foreigner. One other early attempt at forming something like a Panhellenic union ought to be noticed. When the Persian invasion of B.C. 480 was threatening, deputies (πρόβουλοι) met at the Isthmus, sat there in council for some months, and endeavoured to unite Greece against the foreigner.[99] But the one expedition which was sent solely by their instigation proved a failure.[100] And when the danger was over, principally by the combined exertion of Athens and Sparta, this council seems to have died a natural death. Still for a time it acted as a supreme parliament of Greece, and assumed the power to punish with fine or death those Greeks who had medised.[101] Besides these rudimentary leagues, which might, but did not, issue in some form of Panhellenic government, there were periods in Greek history in which the Hegemone of one state did something towards presenting the appearance of union. Thus Polycrates of Samos seemed at one time to be likely to succeed in forming a great Ionian Empire. And in continental Greece, before the Persian wars, we find Sparta occupying the position of an acknowledged court of reference in international questions,[102]—a position in which she probably had been preceded by Argos. And after those wars, by means of the confederacy of Delos, formed at first for one specific purpose—that of keeping the Aegean free of the Persians—Athens gradually rose to the position of an imperial city, claiming active control over the external politics of a considerable portion of Greece and nearly all the islands (B.C. 478-404). But this proved after all but a passing episode in Greek history. Athens perhaps misused her power; and Sparta took up the task with great professions, but in a spirit even less acceptable to the Greek world than that of Athens; and by the peace of Antalcidas (B.C. 387) the issue of the hundred years’ struggle with Persia left one of the fairest portions of Hellas permanently separated from the main body. Asiatic Greece never became Hellenic again. The fall of the Persian empire before the invasion of Alexander for a while reunited it to a semi-Greek power; but Alexander’s death left it a prey to warring tyrants. It lost its prosperity and its commerce; and whatever else it became, it was never independent, or really Hellenic again.