20. About 650 B. C. a great change was introduced into Egypt, by Psammeticus, its king, who, having several rival claimants to the throne, employed the services of Greek soldiers to overcome them. For the first time the country was freely opened to foreigners, and the power of the priesthood broken. Thus the Greeks were instrumental in changing the current of Egyptian history. The Median Kings began to make head in the east, and ventured—after various successful efforts to extend their dominion in other directions—to make direct war on Nineveh. At the close of the century, by the aid of the rebellious Nabopolassar, they succeeded in taking and destroying that city, and the whole of that immense empire was divided between Media and Nabopolassar, who made Babylon his capital. 21. B. C. 590 to 500. Events in this century begin to crowd thick upon each other. The Greeks rapidly advanced; the Romans succeeded, amid constant wars, in securely establishing their state in Italy, marching from conquest to conquest, not without heavy reverses at times, from which they soon recovered. 598—Nebuchadnezzar took Jerusalem for the first time. 594—Solon was made archon at Athens, with almost unlimited power to change the existing institutions, and he introduced many very useful reforms. 588—Jerusalem was destroyed by Nebuchadnezzar, and the Jews carried into captivity to Babylon, where they remained seventy years. Soon after, Nebuchadnezzar conquered Tyre, after a siege of many years, but he found himself in possession of the walls only, for the inhabitants had built another city on an island near by, but inaccessible to the conqueror, and left him a barren conquest. 560—The most memorable event that followed was the union of Media and Persia under the military prowess of Cyrus. He first employed the forces of the Medo-Persian kingdom in Asia Minor, conquering Lydia and the rest of that region, 549—and dethroning Crœsus. Babylon and Egypt had both entered into an alliance with Crœsus against Cyrus, but before they could send Crœsus effectual aid Cyrus had triumphed. He then turned his arms against Babylon 538—which he took by stratagem after a long siege. Egypt was afterward obliged to become tributary to the universal conqueror. 534—Cyrus, who had before been the Persian general of the united armies under the Median king, Cyaxares, who was his maternal uncle, succeeded to the kingdom, and soon after sent the Jews home to their native land. During this period the Greeks swarmed on the eastern part of the Mediterranean sea and carried on nearly all its commerce, the Tyrians being mainly confined to the trade with India, Arabia and the various parts of the Persian empire.