Tian Hongzheng
After mutineers at Chengde, led by Wang Tingcou, assassinated Tian Hongzheng in 821, as part of the subsequent movement of military governors in a campaign against Wang Tingcou (which subsequently ended in failure), Wang Chengyuan was transferred to Fufang Circuit (鄜坊, headquartered in modern Yan'an, Shaanxi). On the way to Fufang, he went to Chang'an to pay homage to Emperor Muzong, who approved of his behavior and met him on several occasions. Soon thereafter, he was transferred to Fengxiang Circuit (鳳翔, headquartered in modern Baoji, Shaanxi). At that time, because Fengxiang Circuit's land was flat, Tufan forces often were able to invade without obstacles. Wang Chengyuan built a fort, Fort Linqian (), at a key strategic point to try to control such incursions. He was subsequently created the Duke of Qi. He also built a city east of the circuit capital Fengxiang to house the merchants who often travelled through the circuit. When his grandmother Lady Li died early in the "Taihe" () era (827-835) of Emperor Muzong's son Emperor Wenzong, she was buried with much honor.