Fang Xuanling
In 626, just 19 days after Emperor Taizong took the throne, Shibobi and Illig were just across the Wei River from Chang'an. Emperor Taizong, accompanied by Gao Shilian and Fang Xuanling, was forced to meet Tujue across the river and personally negotiate peace terms, including tributes to Eastern Turks, before Illig withdrew.