Tekoan, the son of this first Kitan ruler, by giving the aid of his arms to a rebel chieftain in China, secured victory, and a throne for him. In return for such service the newly made Emperor, who fixed his residence or capital at the present Kai fong fu on the south bank of the Hoang Ho, or Yellow River, ceded sixteen districts to Tekoan in Pehche li, Shan si and Liao tung, engaging also to furnish three hundred thousand pieces of silk as his annual tribute. The new Chinese Emperor took the position of vassal to the Kitan, and termed himself his grandson and subject. The successor to this Chinese ruler sought to modify these conditions. Tekoan made war on him; conquered all the provinces north of the Hoang Ho, seized Pien (Kai fong fu), captured the Emperor and sent him to regions north of China. Following Chinese usage the Kitan took a new name for his dynasty, calling it Liao, that is Iron. After the fall of the Tang dynasty five petty lines followed one another on the throne of Kai fong fu in the course of five decades. On the ruins of these dynasties in 960 the house of Sung united nearly all China. This house made war on the Kitans, but failed to win back the districts previously ceded to them, and in 1004, because of hostile action by the Kitans, the Sung Emperor, to gain peace, engaged to pay an annual tribute both in silk and silver. The Kitan Empire lasted two centuries and assumed in its functions Chinese forms, at least externally, but Chinese methods made it feeble. After strong and warlike chiefs came weak and timid Emperors. At last a great man named Aguta rose among the Jutchis, a nomad people living in the lands between the Amoor, the Eastern Ocean and the Sungari River. These formed part of the same Tungus stock as did the Kitans, but they were untouched as yet by luxury. In 1114 Aguta gained a victory over the Kitans, and the following year proclaimed himself Emperor of the Jutchis. The new State he called Aidjin Kurun (Kin kwe in Chinese), that is, Golden Kingdom. He would not act, he said, like the Kitans, who had taken the name of a metal that is eaten by rust very easily and ruined. Aguta subdued the whole Kitan Empire, and died in 1123. Two years later his successor seized Yeliu yen hi, the ninth and last Emperor of the Kitan dynasty, which had endured nine years and two centuries.