Little is known about Zhu Jingmei's background, because, although the official histories of Tang dynasty, the Old Book of Tang and the New Book of Tang, both contained collections of biographies for prominent eunuchs, neither collection contained a biography for Zhu.[1][2] What is known is that Zhu became the eunuch monitor of the army at Jingnan Circuit sometime in or after 880 (when Yang Fuguang was still the eunuch monitor at Jingnan)[3] and in or before 882.[4]
After Zhu took up his position as eunuch monitor at Jingnan, he organized a group of 3,000 elite soldiers into a Zhongyong Army (忠勇軍), under his own command. He also got into conflicts with the military governor Duan Yanmo, and Duan planned to kill him. Zhu preemptively acted and, in 882, attacked and killed Duan. He then made the deputy mayor of Jingnan's capital Jiangling Municipality (江陵) acting military governor. Then-reigning Emperor Xizong (who was then at Chengdu after the imperial capital Chang'an had fallen to the major agrarian rebel Huang Chao), hearing what happened, commissioned the imperial official Zheng Shaoye (鄭紹業), who had previously served as military governor of Jingnan, as military governor. However, Zheng was fearful of Zhu and did not report to Jingnan. Zhu thereafter made the officer Chen Ru acting military governor, a commission that Emperor Xizong subsequently confirmed; yet later in 884, Emperor Xizong made Chen military governor.[4] It was said that while Zhu was in control of Jingnan, he found excuses to slaughter many officers and merchants and seize their wealths, making himself very wealthy. At one point, when Emperor Xizong tried to recall him and replace him with Yang Xuanhui (楊玄晦), he refused to be recalled and settled down in Jiangling.[5]