After Chancellorship
After some time had elapsed, Zheng Yin was made the military governor of Lingnan Circuit (嶺南, headquartered in modern Guangzhou, Guangdong) as well as prefect of Lingnan's capital prefecture Guang Prefecture (廣州), and it was said that Zheng was known for his uncorrupt rule. He was later recalled to serve as minister of public works (工部尚書, Gongbu Shangshu) and the minister of worship (太常卿, Taichang Qing). Yet later, he served as the prefect of Tong Prefecture (同州, in modern Weinan, Shaanxi) as well as the director of Changchun Palace (長春宮). Later, he served as the official in charge of the eastern capital Luoyang. He was then recalled to be the minister of defense (兵部尚書, Bingbu Shangshu) but soon thereafter made the military governor of Hezhong Circuit (河中, headquartered in modern Yuncheng, Shanxi).
In 828, during the reign of Emperor Xianzong's grandson Emperor Wenzong, Zheng was recalled to serve as chief imperial censor (御史大夫, Yushi Daifu) and advisor to the Crown Prince. As by this point, he was old (76 in age) and weak, he repeatedly requested retirement. Emperor Wenzong thus granted him the title of senior advisor to the Crown Prince and allowed him to retire. He died in late 829 and was given the posthumous name of Xuan (宣, "responsible").
It was said in the Book of Tang that Zheng became an official on account of his literary abilities, and that served inside and outside the palace for more than 40 years. He was not known for great accomplishments, but he followed the laws properly. He often spent time on tour with knowledgeable and history-minded persons, and the people respected him for his virtues.
Read more about this topic: Zheng Yin (Middle Tang)