Tian Hongzheng
In spring 820, Emperor Xianzong died and was succeeded by his son Emperor Muzong. In winter 820, after Wang Chengzong died, the Chengde soldiers supported Wang Chengzong's brother Wang Chengyuan as successor, but Wang Chengyuan, while pretending to accept, sent secret submissions to Emperor Muzong declining the position. Emperor Muzong thus carried out a group of military governor movements for Weibo, Chengde, and three other nearby circuits — making Tian Hongzheng the military governor of Chengde, Wang Chengyuan the military governor of Yicheng, Liu Wu the military governor of Zhaoyi Circuit (昭義, headquartered in modern Changzhi, Shanxi), Li Su the military governor of Weibo, and Tian Bu the military governor of Heyang. (Emperor Muzong's making Tian Hongzheng military governor of Chengde was against the advice of the general Yang Yuanqing (), who also tried to persuade the chancellors that it was not a good idea, but Yang's suggestions were also ignored by the chancellors.)