The victories of Akutêng over the Kitans were most welcome to the Chinese Emperor, who saw his late oppressors humbled to the dust by the victorious Nü-chêns; and in 1120 a treaty of alliance was signed by the two powers against the common enemy. The upshot of this move was that the Kitans were severely defeated in all directions, and their chief cities fell into the hands of the Nü-chêns, who finally succeeded, in 1122, in taking Peking by assault, the Kitan Emperor having already sought safety in flight. When, however, the time came for an equitable settlement of territory between China and the victorious Nü-chêns, the Chinese Emperor discovered that the Nü-chêns, inasmuch as they had done most of the fighting, were determined to have the lion's share of the reward; in fact, the yoke imposed by the latter proved if anything more burdensome than that of the dreaded Kitans. More territory was taken by the Nü-chêns, and even larger levies of money were exacted, while the same old farce of worthless tribute was carried on as before. In 1123, Akutêng died, and was canonised as the first Emperor of the Chin, or Golden Dynasty. He was succeeded by a brother; and two years later, the last Emperor of the Kitans was captured and relegated to private life, thus bringing the dynasty to an end. The new Emperor of the Nü-chêns spent the rest of his life in one long struggle with China. In 1126, the Sung capital, the modern K'ai-fêng Fu in Honan, was twice besieged: on the first occasion for thirty-three days, when a heavy ransom was exacted and some territory was ceded; on the second occasion for forty days, when it fell, and was given up to pillage. In 1127, the feeble Chinese Emperor was seized and carried off, and by 1129 the whole of China north of the Yang-tsze was in the hands of the Nü-chêns. The younger brother of the banished Emperor was proclaimed by the Chinese at Nanking, and managed to set up what is known as the southern Sung dynasty; but the Nü-chêns gave him no rest, driving him first out of Nanking, and then out of Hangchow, where he had once more established a capital. Ultimately, there was peace of a more or less permanent character, chiefly due to the genius of a notable Chinese general of the day; and the Nü-chêns had to accept the Yang-tsze as the dividing line between the two powers. The next seventy years were freely marked by raids, first of one side and then of the other; but by the close of the twelfth century the Mongols were pressing the Nü-chêns from the north, and the southern Sungs were seizing the opportunity to attack their old enemies from the south. Finally, in 1234, the independence of the Golden Dynasty of Nü-chêns was extinguished by Ogotai, third son of the great Genghis Khan, with the aid of the southern Sungs, who were themselves in turn wiped out by Kublai Khan, the first Mongol Emperor to rule over a united China.