In this way the Athenians walled their city in a little while. To this day the building shows signs of the haste of its execution; the foundations are laid of stones of all kinds, and in some places not wrought or fitted, but placed just in the order in which they were brought by the different hands; and many columns, too, from tombs, and sculptured stones were put in with the rest. For the bounds of the city were extended at every point of the circumference; and so they laid hands on everything without exception in their haste.
Themistocles also persuaded them to finish the walls of Piraeus, which had been begun before, in his year of office as archon; being influenced alike by the fineness of a locality that has three natural harbours, and by the great start which the Athenians would gain in the acquisition of power by becoming a naval people. For he first ventured to tell them to stick to the sea and forthwith began to lay the foundations of the empire. It was by his advice, too, that they built the walls of that thickness which can still be discerned round Piraeus, the stones being brought up by two wagons meeting each other. Between the walls thus formed there was neither rubble nor mortar, but great stones hewn square and fitted together, cramped to each other on the outside with iron and lead. About half the height that he intended was finished. His idea was by their size and thickness to keep off the attacks of an enemy; he thought that they might be adequately defended by a small garrison of invalids, and the rest be freed for service in the fleet. For the fleet claimed most of his attention. He saw, as I think, that the approach by sea was easier for the king's army than that by land: he also thought Piraeus more valuable than the upper city; indeed, he was always advising the Athenians, if a day should come when they were hard pressed by land, to go down into Piraeus, and defy the world with their fleet. Thus, therefore, the Athenians completed their wall, and commenced their other buildings immediately after the retreat of the Mede.
Meanwhile Pausanias, son of Cleombrotus, was sent out from Lacedaemon as commander-in-chief of the Hellenes, with twenty ships from Peloponnese. With him sailed the Athenians with thirty ships, and a number of the other allies. They made an expedition against Cyprus and subdued most of the island, and afterwards against Byzantium, which was in the hands of the Medes, and compelled it to surrender.
This event took place while the Spartans were still supreme. But the violence of Pausanias had already begun to be disagreeable to the Hellenes, particularly to the Ionians and the newly liberated populations. These resorted to the Athenians and requested them as their kinsmen to become their leaders, and to stop any attempt at violence on the part of Pausanias. The Athenians accepted their overtures, and determined to put down any attempt of the kind and to settle everything else as their interests might seem to demand. In the meantime the Lacedaemonians recalled Pausanias for an investigation of the reports which had reached them. Manifold and grave accusations had been brought against him by Hellenes arriving in Sparta; and, to all appearance, there had been in him more of the mimicry of a despot than of the attitude of a general. As it happened, his recall came just at the time when the hatred which he had inspired had induced the allies to desert him, the soldiers from Peloponnese excepted, and to range themselves by the side of the Athenians. On his arrival at Lacedaemon, he was censured for his private acts of oppression, but was acquitted on the heaviest counts and pronounced not guilty; it must be known that the charge of Medism formed one of the principal, and to all appearance one of the best founded, articles against him.
The Lacedaemonians did not, however, restore him to his command, but sent out Dorkis and certain others with a small force; who found the allies no longer inclined to concede to them the supremacy. Perceiving this they departed, and the Lacedaemonians did not send out any to succeed them. They feared for those who went out a deterioration similar to that observable in Pausanias; besides, they desired to be rid of the Median War, and were satisfied of the competency of the Athenians for the position, and of their friendship at the time towards themselves.
The Athenians, having thus succeeded to the supremacy by the voluntary act of the allies through their hatred of Pausanias, fixed which cities were to contribute money against the barbarian, which ships; their professed object being to retaliate for their sufferings by ravaging the King's country. Now was the time that the office of "Treasurers for Hellas" was first instituted by the Athenians. These officers received the tribute, as the money contributed was called. The tribute was first fixed at four hundred and sixty talents. The common treasury was at Delos, and the congresses were held in the temple. Their supremacy commenced with independent allies who acted on the resolutions of a common congress. It was marked by the following undertakings in war and in administration during the interval between the Median and the present war, against the barbarian, against their own rebel allies, and against the Peloponnesian powers which would come in contact with them on various occasions. My excuse for relating these events, and for venturing on this digression, is that this passage of history has been omitted by all my predecessors, who have confined themselves either to Hellenic history before the Median War, or the Median War itself. Hellanicus, it is true, did touch on these events in his Athenian history; but he is somewhat concise and not accurate in his dates. Besides, the history of these events contains an explanation of the growth of the Athenian empire.