毘伽可汗
On August 1, 646, the Xueyantuo were defeated by the Uyghur (Huihe, 回纥) and the Chinese. The Xueyantuo's Duomi Khan, Bazhuo, was killed by the Uyghur. A Tang army led by the general Li Daozong, the Prince of Jiangxia, crushed the Xueyantuo forces. The last Xueyantuo khan, the Yitewushi Khan Duomozhi, surrendered. Their remnants were destroyed two years later, on September 15. The Sir re-appeared later as "[Al]tï Sir" "Six Sir Tribes", subjects of the Latter Turk ruler Bilge Khagan,; Klyashtorny controversially proposed that Sir were precursors to Kipchaks.