Wang Ya
Meanwhile, Zheng's predecessor Li Ting (), who was a son of the famed general Li Sheng (and a brother of Li Su's) and who looked down at Zheng, was disrespectful to him. After Zheng arrived at Fengxiang, he submitted a report that accused Li Ting of being cruel and corrupt. As a result, Li Ting was stripped of his post as the military governor of Zhongwu Circuit (忠武, headquartered in modern Xuchang, Henan). Zheng also suggested that the way to make the state and the people wealthy was to collect tea taxes. Emperor Wenzong thus made Wang Ya assume the additional post as the collector of tea taxes, and while Wang Ya knew that tea taxes would create problems for the people, he nevertheless collected the taxes. Also, at Li Xun's and Zheng's suggestion, Emperor Wenzong had poison wine sent to Wang Shoucheng to poison him to death.