Zheng Xu (700-765) is known as Ci 'en,No. Lushui andNo. Evening Placanticline. Uncle Xu Hong was born in Xin 'an, Zhejiang Province. He is the uncle of the No.1 scholar in the Tang Dynasty and the first scholar in the history of the Xu family in China. In the 21st year of Emperor Xuanzong of the Tang Dynasty (733), he was the top scholar in Gui You. It is on the same list as the Tang Dynasty Jinshi and Fujian County Magistrate Huang Yao. The list includes 25 scholars. Zheng Xu is honest and loyal by nature. He was an official in Anping, Fujian, and a junior inspector in Jinjiang County. Later, he was killed by the traitor Li, and died in Xu Zhai (later called Xu CuO) of Haiyung Shengli Changyuanbao in Jinjiang Apartment Bay, Fujian Province, but he did not die.