Tian Chengsi
In the aftermaths of Yan's destruction, Emperor Daizong contemplated what to do with several Yan generals who had surrendered to Tang but who still retained substantial holdings—Xue Song, Li Huaixian, Zhang Zhongzhi (on whom Emperor Daizong soon bestowed the imperial surname of Li and a new personal name, Baochen), and Tian Chengsi. Pugu suggested that he allow them to remain at their posts as military governors ("Jiedushi") to avoid further resistance, and Emperor Daizong, fearful of further wars, agreed. This would mark the beginning of warlordism that plagued Tang for the rest of the dynasty.