The Juchen in the past had been only a small league of Tungus tribes, whose name is preserved in that of the present Tungus tribe of the Jurchen, which came under the domination of the Kitan after the collapse of the state of Po-hai in northern Korea. We have already briefly mentioned the reasons for their rise. After their first successes against the Kitan (1114), their chieftain at once proclaimed himself emperor (1115), giving his dynasty the name "Chin" (The Golden). The Chin quickly continued their victorious progress. In 1125 the Kitan empire was destroyed. It will be remembered that the Sung were at once attacked, although they had recently been allied with the Chin against the Kitan. In 1126 the Sung capital was taken. The Chin invasions were pushed farther south, and in 1130 the Yangtze was crossed. But the Chin did not hold the whole of these conquests. Their empire was not yet consolidated. Their partial withdrawal closed the first phase of the Chin empire.