After the victory of Tanagra, the Lacedæmonians made no further expeditions out of Peloponnesus for several succeeding years, not even to prevent Bœotia and Phocis from being absorbed into the Athenian alliance. The reason of this remissness lay, partly, in their general character; partly, in the continuance of the siege of Ithome, which occupied them at home; but still more perhaps, in the fact that the Athenians, masters of the Megarid, were in occupation of the road over the high lands of Geranea, and could therefore obstruct the march of any army out from Peloponnesus. Even after the surrender of Ithome, the Lacedæmonians remained inactive for three years, after which time a formal truce was concluded with Athens by the Peloponnesians generally, for five years longer. This truce was concluded in a great degree through the influence of Cimon, who was eager to resume effective operations against the Persians; while it was not less suitable to the political interest of Pericles that his most distinguished rival should be absent on foreign service, so as not to interfere with his influence at home. Accordingly Cimon, having equipped a fleet of two hundred triremes from Athens and her confederates, set sail for Cyprus, from whence he despatched sixty ships to Egypt, at the request of the insurgent prince Amyrtæus, who was still maintaining himself against the Persians amidst the fens—while with the remaining armament he laid siege to Citium. In the prosecution of this siege, he died either of disease or of a wound. The armament, under his successor Anaxicrates, became so embarrassed for want of provisions that they abandoned the undertaking altogether, and went to fight the Phœnician and Cilician fleet near Salamis in Cyprus. They were here victorious, first on sea and afterwards on land, though probably not on the same day, as at the Eurymedon; after which they returned home, followed by the sixty ships which had gone to Egypt for the purpose of aiding Amyrtæus.
From this time forward no further operations were undertaken by Athens and her confederacy against the Persians. And it appears that a convention was concluded between them, whereby the Great King on his part promised two things: To leave free, undisturbed, and untaxed, the Asiatic maritime Greeks, not sending troops within a given distance of the coast: To refrain from sending any ships of war either westward of Phaselis (others place the boundary at the Chelidonean islands, rather more to the westward) or within the Cyanean rocks at the confluence of the Thracian Bosporus with the Euxine. On their side the Athenians agreed to leave him in undisturbed possession of Cyprus and Egypt. This was called the Peace of Callias.
We may believe in the reality of this treaty between Athens and Persia, improperly called the Cimonian Treaty: improperly, since not only was it concluded after the death of Cimon, but the Athenian victories by which it was immediately brought on, were gained after his death. Nay more—the probability is, that if Cimon had lived, it would not have been concluded at all. For his interest as well as his glory led him to prosecute the war against Persia, since he was no match for his rival Pericles either as a statesman or as an orator, and could only maintain his popularity by the same means whereby he had earned it—victories and plunder at the cost of the Persians. His death ensured more complete ascendency to Pericles whose policy and character were of a cast altogether opposite.
THE CONFEDERACY BECOMES AN EMPIRE