Zheng Yanchang

Zheng Yanchang (鄭延昌), courtesy name Guangyuan (光遠), was an official of the Chinese dynasty Tang Dynasty, serving as a chancellor during the reign of Emperor Zhaozong in the 9th century.

It is not known when Zheng Yanchang was born. His family was part of the Zheng clan known as the "Northern Ancestor" branch and traced its line from the ruling house of the Spring and Autumn period state Zheng; its ancestors also included officials of Han Dynasty, Cao Wei, Jin Dynasty (265-420), Later Zhao, Former Yan and/or Later Yan, Northern Wei, Northern Zhou, and Tang Dynasty. Of Zheng Yanchang's closer relatives was his third cousin Zheng Congdang, who was a chancellor during the reign of Emperor Xizong. (Zheng Congdang's grandfather Zheng Yuqing was a chancellor during the reign of Emperor Xizong's great-great-grandfather Emperor Dezong.) However, Zheng Yanchang's own immediate ancestors did not appear to be particularly prominent — as his great-grandfather Zheng Shen (鄭申) was a county sheriff and his grandfather Zheng Zezhi (鄭則之) was an imperial guard officer, although his father Zheng Yi (鄭猗) was a prefectural prefect. He had at least one older brother, Zheng Yunsheng (鄭允升), and one younger brother, Zheng Yanji (鄭延濟).

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