Tian Hongzheng
As a result of Emperor Xianzong's military victories, the various circuits all submitted to his rule. After Emperor Xianzong died in 820 and was succeeded by his son Emperor Muzong, however, soldiers at Lulong (盧龍, headquartered in modern Beijing) and Chengde (成德, headquartered in modern Shijiazhuang, Hebei) Chengde rebelled under the leadership of Zhu Kerong and Wang Tingcou, respectively, in 821 — and in Wang's uprising, he killed Tian Hongzheng, who had been transferred to Chengde Circuit. Tian's successor as military governor of Weibo, Li Su, was originally set to launch a campaign against Chengde when he fell ill. Emperor Muzong thus made Tian's son Tian Bu as the new military governor of Weibo.