In 776, after the death of Biansong Circuit (汴宋, headquartered in modern Kaifeng, Henan)'s acting military governor Tian Shenyu (), its officer Li Lingyao () seized the circuit. Emperor Daizong commissioned a campaign by the surrounding circuits against Biansong and Li Lingyao, despite aid from Tian, was quickly defeated, although the imperial government received little benefit as five of Biansong's eight prefectures were taken by and merged into Li Zhengji's Pinglu Circuit, and, indeed, Li Zhengji then moved his headquarters from Qing Prefecture () to one of the Biansong prefectures he took, Yun Prefecture (鄆州, in modern Tai'an, Shandong).