He sprang, then, from Anshan, the immediate neighbour of Babylonia to the east. This is the direction indicated in the second verse of this forty-first chapter: _Who hath raised up one from the east?_ But the twenty-fifth verse veers round with him to the north: _I have raised up one from the north, and he is come._ This was actually the curve, from east to north, which his career almost immediately took. For in 549 Astyages, king of Media, attacked Cyrus,[58] king of Anshan; which means that Cyrus was already a considerable and an aggressive prince. Probably he had united by this time the two domains of his house, Persia and Anshan, under his own sceptre, and secured as his lieutenant Hystaspes, his cousin, the lineal king of Persia. The Mede, looking south and east from Ecbatana, saw a solid front opposed to him, and resolved to crush it before it grew more formidable. But the Aryans among the Medes, dissatisfied with so indolent a leader as Astyages, revolted to Cyrus, and so the latter, with characteristic good fortune, easily became lord of Media. A lenient lord he made. He spared Astyages, and ranked the Aryan Medes second only to the Persians. But it took him till 546 to complete his conquest. When he had done so he stood master of Asia from the Halys to perhaps as far east as the Indus. He replaced the Medes in the threefold power of Western Asia, and thus looked down on Babylon, as v. 25 says, _from the north_ (xli. 25). In 545, Cyrus advanced upon Babylonia, and struck at the northern line of fortifications at Sippara. He was opposed by an army under Belshazzar, Bel-shar-uzzur, the son of Nabunahid, and probably by his mother's side grandson of Nebuchadrezzar. Army or fortifications seem to have been too much for Cyrus, and there is no further mention of his name in the Babylonian annals till the year 538. It has been suggested that Cyrus was aware of the discontent of the people with their ruler Nabunahid, and, with that genius which distinguished his whole career for availing himself of the internal politics of his foes, he may have been content to wait till the Babylonian dissatisfaction had grown riper, perhaps in the meantime fostering it by his own emissaries.