Athens rebuilt and fortified by Themistocles despite of Spartan jealousy, 478: formation of the Piraeus, an event of still greater importance, 477.--Naval expedition under Pausanias, accompanied by Aristides and Cimon, undertaken against Cyprus and Byzantium, for the purpose of expelling the Persians, 470. Treachery and fall of Pausanias, 469. In consequence of the Spartans' haughtiness, the supreme command devolves upon the Athenians. 8. This transfer of the command to Athens had a decided effect on all the subsequent relations of Greece, not only because it augmented the jealousy between Sparta and Athens, but because Athens exercised her predominance for a purpose entirely different from that of Sparta.--Establishment of a permanent confederacy, comprising most of the Grecian states without Peloponnesus, especially the islands, and an adjustment of the contributions to be annually furnished by each, with the view of prosecuting the Persian war, and liberating the Asiatic Greeks from the Persian yoke. Although the common treasury was first established at Delos, the superintendence of it was confided to Athens; and such a manager as Aristides was not always to be found.--Natural consequence of this new establishment: 1. What had hitherto been mere military precedence, becomes in the hands of Athens a right of political prescription, and that, as usual, is soon converted into a sovereignty. Hence her idea of the supremacy of Greece, ([Greek: arche tes Hellados],) as connected with that of the sea, ([Greek: thalassokratia].) 2. The oppression of the Athenians, sometimes real, at other times presumed, after a short time, rouses the spirit of discontent and contumacy among several of the confederates: hence, 3. The gradual formation of a counter league, headed by Sparta, who maintains her supremacy over the greatest part of the Peloponnesus. 9. The changes introduced into the internal organization are not to be determined solely by the palpable alterations made in any of Lycurgus's or Solon's institutions. In Sparta, the general frame-work of Lycurgus's constitution subsisted; nevertheless the power was virtually in the hands of the ephori, whose dictatorial sway placed Sparta in the formidable posture she now assumed.--At Athens, in proportion as the importance of foreign relations increased, and amid the protracted struggles between the heads of the democratic and aristocratic parties, the real power, under the outward appearance of a democracy, gradually centered in the hands of the ten annually elected generals, ([Greek: strategoi],) who with more or less effect played the parts of demagogues. Abrogation of the law that excluded the poorer citizens from official situations, B. C. 478. Expulsion of Themistocles, implicated in the fall of Pausanias, principally through the intrigues of Sparta: he is first banished by ostracism, 469, but in consequence of further persecution he flies over to the Persians, 466.