stylistic:tone, information:extraction, information:classification
Lulong Circuit

Li Huaixian and fellow Yan generals Xue Song, Li Baochen, and Tian Chengsi submitted to Tang thus were allowed to keep their territory. Li Huaixian was made the military governor (jiedushi) of Lulong Circuit (盧龍, headquartered in modern Beijing) consisting of Youzhou, the core territory of the former Yan. In 768, Li Huaixian was killed by his subordinates Zhu Xicai, who then took over command of the circuit. Lulong Jiedushi remained a semi-independent fief, survived the fragmentation of Tang until being annexed by Li Cunxu 's Jin state in 913.