Zheng Yanchang (鄭延昌), courtesy name Guangyuan (光遠), was an official of the Chinese Tang dynasty, who served as a chancellor during the reign of Emperor Zhaozong in the 9th century.
[2] After the major agrarian rebel Huang Chao attacked the imperial capital Chang'an in 880, forcing Emperor Xizong to flee to Chengdu, Emperor Xizong left Zheng Tian in command of the remaining Tang forces in the capital region.
Later (it is unclear whether Zheng Tian was still chancellor by this point), Zheng Yanchang was made the deputy minister of defense (兵部侍郎, Bingbu Shilang), the mayor of Jingzhao Municipality (京兆, i.e., the Chang'an region), and the acting director of finances (判度支, Pan Duzhi).
[2] In 893, when the warlord Li Maozhen the military governor of Fengxiang tried to foster protests at Chang'an against Emperor Zhaozong's planned campaign against him, the protest crowd surrounded Zheng and fellow chancellor Cui Zhaowei on one occasion and attacked them, forcing them to take refuge in people's houses.
[5] In 894, Zheng was removed from his chancellorship and made You Pushe (右僕射), one of the heads of the executive bureau (尚書省, Shangshu Sheng),[5] as he was ill.