Li Guangbi
The third son of Xuanzong, Li Heng, was proclaimed Emperor Suzong at Lingzhou (modern-day Lingwu), although another group of local officials and Confucian literati tried to promote a different prince, Li Lin, the Prince of Yong, at Jinling (modern-day Nanjing). One of Suzong's first acts as emperor was to appoint the generals Guo Ziyi and Li Guangbi to deal with the rebellion. The generals, after much discussion, decided to borrow troops from an offshoot of the Turkish Tujue tribe, the Huihe, or Huige, also known as the Uyghur Khaganate (ancestors of the modern-day Uyghurs, but then located in Mongolia), who were ruled by Bayanchur Khan until his death in the summer of 759. Four thousand Arab mercenaries were sent by the Abbasid caliph al-Mansur to join the Tang in 756, staying in China after the war.