Beginning of Peloponnesian War

It was from this period (B.C. 461) that the long administration of Pericles may be said to have commenced. The effects of his accession to power soon became visible in the foreign relations of Athens. Pericles had succeeded to the political principles of Themistocles, and his aim was to render Athens the leading power of Greece. The Confederacy of Delos had already secured her maritime ascendency; Pericles directed his policy to the extension of her influence in continental Greece. She formed an alliance with the Thessalians, Argos, and Megara. The possession of Megara was of great importance, as it enabled the Athenians to arrest the progress of an invading army from Peloponnesus, AEgina, so long the maritime rival of Athens, was subdued and made tributary. The Athenians marched with rapid steps to the dominion of Greece. Shortly afterwards the battle of OEnophyta (B.C. 456), in which the Athenians defeated the Boeotians, gave Athens the command of Thebes, and of all the other Boeotian towns. From the gulf of Corinth to the straits of Thermopylae Athenian influence was now predominant. During these events the Athenians had continued to prosecute the war against Persia. In the year B.C. 460 they sent a powerful fleet to Egypt to assist Inarus, who had revolted against Persia; but this expedition proved a complete failure, for at the end of six years the revolt was put down by the Persians, and the Athenian fleet destroyed (B.C. 455). At a later period (B.C. 449) Cimon, who had been recalled from exile, sailed to Cyprus with a fleet of 200 ships. He undertook the siege of Citium in that island; but died during the progress of it, either from disease or from the effects of a wound. Shortly afterwards a pacification was concluded with Persia, which is sometimes, but erroneously, called "the peace of Cimon." It is stated that by this compact the Persian monarch agreed not to tax or molest the Greek colonies on the coast of Asia Minor, nor to send any vessels of war westward of Phaselis in Lycia, or within the Cyanean rocks at the junction of the Euxine with the Thracian Bosporus; the Athenians on their side undertaking to leave the Persians in undisturbed possession of Cyprus and Egypt. During the progress of these events, the states which formed the Confederacy of Delos, with the exception of Chios, Lesbos, and Samos, had gradually become, instead of the active allies of Athens, her disarmed and passive tributaries. Even the custody of the fund had been transferred from Delos to Athens. The purpose for which the confederacy had been originally organised disappeared with the Persian peace; yet what may now be called Imperial Athens continued, for her own ends, to exercise her prerogatives as head of the league. Her alliances, as we have seen, had likewise been extended in continental Greece, where they embraced Megara, Boeotia, Phocis, Locris, together with Troezen and Achaia in Peloponnesus. Such was the position of Athens in the year 448 B.C., the period of her greatest power and prosperity. From this time her empire began to decline; whilst Sparta, and other watchful and jealous enemies, stood ever ready to strike a blow.

William Smith, A Smaller History of Ancient Greece

From the end of the Persian Wars to the beginning of the Peloponnesian War, B.C. 479-431

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