PERIOD OF ATHENIAN SUPREMACY. (479-431 B.C.) REBUILDING THE WALLS OF ATHENS.--After the Persians had been expelled from Greece, the first care of the Athenians was the rebuilding of their homes. Their next task was the restoration of the city walls. The exalted hopes for the future which had been raised by the almost incredible achievements of the past few months, led the Athenians to draw a vast circuit of seven miles about the Acropolis as the line of the new ramparts. The rival states of the Peloponnesus watched the proceedings of the Athenians with the most jealous interest. While they could not but admire Athens, they feared her. Sparta sent an embassy to dissuade the citizens from rebuilding the walls, hypocritically assigning as the cause of her interest in the matter her solicitude lest, in case of another Persian invasion, the city, if captured, might become a shelter and defence to the enemy. But the Athenians persisted in their purpose, and in a marvellously short time had raised the wall to such a height that they could defy interference. THEMISTOCLES' NAVAL POLICY.--Themistocles saw clearly that the supremacy of Athens among the Grecian states must be secured and maintained by her mastery of the sea. He had unbounded visions of the maritime power and glory that might come to her through her fleet, those "wooden walls" to which at this moment she owed her very existence; and he succeeded in inspiring his countrymen with his own enthusiasm and sanguine hopes. In the prosecution of his views, Themistocles persuaded the Athenians to enlarge the harbor of Piræus, the most spacious of the ports of Athens, and to surround the place with immense walls, far exceeding, both in compass and strength, those of the capital. He also led his countrymen to the resolution of adding each year twenty well-equipped triremes to their navy. This policy, initiated by Themistocles, was, as we shall see, zealously pursued by the statesmen that after him successively assumed the lead in Athenian affairs. HIS OSTRACISM.--Themistocles well deserved the honor of being called, as he was, the founder of the New Athens. But, although an able statesman, he was an unscrupulous man. He accepted bribes and sold his influence, thereby acquiring an enormous property. Finally he was ostracized (471 B.C.). After long wanderings, he became a resident at the court of the Persian king. Tradition affirms that Artaxerxes, in accordance with Persian usage, provided for the courtier exile by assigning to three cities in Asia Minor the care of providing for his table: one furnished bread, a second meat, and a third wines. It is told that one day, as he sat down to his richly loaded board, he exclaimed, "How much we should have lost, my children, if we had not been ruined!"