When the Chinese government of the Song Dynasty 宋 asked the chieftain of the Jurchen (Mongolian: Jürched, Jürchen; Chinese: Nüzhen 女真) people that roamed the northeast of China (modern Manchuria) for help against the Liao Empire 遼, they did not expect that the Jurchen people would be fierce enough to be a danger for Song China herself. Offspring of the Tungus branch of the Altaic people, and ancestor of the Manchu that should eventually found the Qing Dynasty 清, the Jurchen ruler Wanyan Aguda 完顏阿骨打 proclaimed himself as emperor of a Jin Dynasty 金 in 1115. After defeiting the Liao Empire, Emperor Ukimai started to attack Song China. The Song capital Kaifeng (Bianjing 汴京, modern Kaifeng/Henan) was occupied, the Song emperor taken as a hostage, and the government had to flee to the south where they established their southern capital at Hangzhou 杭州/Zhejiang (Lin'an 臨安). Only in 1142, the Jin Dynasty that had occupied the whole north of China, concluded a peace treaty with the Southern Song. Like the Liao Dynasty before, the Jin emperors quickly adopted the Chinese governmental system and employed Chinese officials in their government. Similar to the Qing Dynasty later, official documents were translated from Chinese to Jurchen, for which language a special script was developed. And, very similar to their forerunners in north China (the Liao Dynasty), the Jin government was slain by economical desasters at the eve of the Mongol conquest. In 1234, the Jin government fell victim to the ruthless conquest war of the mightiest nomad rule the world has ever seen. With the Jin Dynasty's fall, Southern Song China was open for the conquerors. Like the ruling class of the Jin Empire adopted Chinese culture and customs, they also imitated the governmental structure and official documentary machinery of the neighboring Song Empire.