For some hundred years Babylon had been cruelly ill-treated by the Assyrians, and never-ending revolts had been the consequence. Nabopolassar began the work of restoration, and his son NEBUCHADNEZZAR, the real hero of the Second Chaldee Empire, carried it on with ardour during the whole of his long reign. "He restored the canals which united the Tigris to the Euphrates above Babylon; he rebuilt the bridge which gave a means of communication between the two halves of the city; he repaired the great reservoirs in which the early kings had caught and stored the superfluous waters of the Euphrates during the annual inundation. Upon these works his prisoners of war, Syrians and Egyptians, Jews and Arabs, were employed in vast numbers. The great wall of Babylon was set up anew; so was the temple of Nebo at Borsippa; the reservoir at Sippara, the royal canal, and a part at least of Lake Pallacopas, were excavated; Kouti, Sippara, Borsippa, Babel, rose upon their own ruins. Nebuchadnezzar was to Chaldaea what Rameses II. was to Egypt, and there is not a place in Babylon or about it where his name and the signs of his marvellous activity cannot be found."[80] Nebuchadnezzar reigned forty-three years (604-561), and left Babylon the largest and finest city of Asia. After his death the decadence was rapid. A few years saw several kings succeed one another upon the throne, while a revolution was being accomplished upon the plateau of Iran which was destined to be fatal to Chaldaea. The supremacy in that region passed from the feeble and exhausted Medes into the hands of the Persians, another people of the same stock. The latter were a tribe of mountaineers teeming with native energy, and their strength had been systematically organized by a young and valiant chief, in whom they had full confidence because he had given them confidence in themselves. CYRUS began by leading them to the conquest of Media, Assyria, and Asia Minor, and by forcing the nations who dwelt between the southern confines of Persia and the mountains of Upper India to acknowledge his supremacy. Finally, he collected his forces for an attack upon Chaldaea, and, in 536, Babylon fell before his arms. * * * * *