Tian Hongzheng
When Wang Wujun's grandson Wang Chengzong died in 820, Wang Chengzong's brother Wang Chengyuan temporarily took over command of the circuit but requested to be transferred, fearing to be targeted as a warlord. At that time, Wang Tingcou served as the commander of Wang Chengyuan's guards. Then-reigning Emperor Muzong transferred Tian Hongzheng the military governor of Weibo Circuit (魏博, headquartered in modern Handan, Hebei) to Chengde and transferred Wang Chengyuan to Yicheng Circuit (義成, headquartered in modern Anyang, Henan). Wang Chengyuan subsequently left Chengde and headed for Yicheng despite the attempts by some soldiers to detain him at Chengde.