Secretary - Inancu Baga Tarkan and a Chief Minister - Bilge Tay Sanggun. He also appointed his sons as viceroys over Western (Tardush) and Eastern (Töles) tribes. Involvement in An Lushan rebellion Emperor Suzong of Tang appealed to Bayanchur in 756 for help against An Lushan, sending his second cousin Li Chengcai (李承寀) the Prince of Dunhuang and Pugu Huai'en as emissaries. Uyghur troops were instrumental in dealing with rebellion. Uyghur forces led by Uyghur Prince Ulu Bilge Yabgu and general Dide arrived at Emperor Suzong's then-headquarters at Fengxiang (鳳翔, in modern Baoji) to join the elite Tang forces recalled from the Anxi Circuit and the Western Regions (Xiyu). Emperor Suzong did so by promising that the Uyghur forces would be permitted to pillage the Chang'an region once it was recaptured. Chinese chancellor Li Mi suggested that these forces be used to attack An Lushan's power base at Fanyang first, to root out the possibility of a recovery. Emperor Suzong chose not to do so and decided to attack Chang'an first, with Li Chu in command of the joint forces. The forces recaptured Chang'an in fall 757, allowing Emperor Suzong to rebuild his administration in the capital. The Uyghurs were set on pillaging Chang'an, but Li Chu begged the Uyghur prince Ulu Bilge Yabgu commanding Uyghur forces to plead to delay the pillage—pointing out that if pillaging were carried out, the people of the eastern capital Luoyang, then serving as Yan's capital, would resist heavily, and asking that the Uyghurs pillage Luoyang instead. Death Bayanchur Khan died soon after completion of his successful expedition against the Yenisei Kirghiz in the Sayan Mountains in May of 759 during a feast. Family Bayanchur was married to a Uyghur who was created El Bilge Khatun () in 747 and Princess Xiaoguo (蕭公主) on 25 August 758, daughter of Suzong. Marriage to a true daughter of a Chinese emperor was unprecedented. She left for China after Bayanchur's death. Bayanchur had at least two sons: Ulu Bilge Tardush Yabghu - commander of western part of the empire, who was commanding officer of Uyghurs in An Lushan rebellion, thought to be executed by his father in 759. Bögü Qaghan - commander of eastern part of the empire, succeeded his father. He also adopted his sister-in-law and married her to Prince Li Chengcai (李承采), Prince of Dunhuang (敦煌王李承采), son of Li Shouli, Prince of Bin in 758.