Cheng Rui (成汭 died June 10, 903 Zizhi Tongjian, vol. 264.Academia Sinica Chinese-Western Calendar Converter.), adoptive name Guo Yu (郭禹 used until c. 888), formally the Prince of Shanggu (上谷王), was a warlord late in the Chinese Tang dynasty who ruled Jingnan Circuit (荊南 headquartered in modern Jingzhou, Hubei) from 888 to 903, until he was defeated in battle. He was known to be a capable administrator who treated his people well.
At a later point, Guo Yu left Qin's army and became a bandit in Huomen Mountain (火門山, in modern Tianmen, Hubei). He eventually surrendered to Chen Ru the military governor of Jingnan Circuit and became an officer there.
In 885, Chen Ru was overthrown by Zhang Gui, who took over the circuit and arrested Chen. Zhang was apprehensive of Guo's ferocity and wanted to kill him. When Guo realized this, he took some 1,000 men and fled from Jingnan's capital Jiangling County. He attacked and captured Gui Prefecture (歸州, in modern Yichang, Hubei), claiming the title of prefect. Zizhi Tongjian, vol. 256.
In 887, Qin's general Zhao Deyin attacked and captured Jingnan Circuit, executing Zhang. He left his officer Wang Jianzhao at Jiangling to defend it. In summer 888, Guo attacked Jiangling and expelled Wang, who fled to Qian Prefecture (黔州, in modern Chongqing). Then-reigning Emperor Zhaozong commissioned Guo as acting military governor and later full military governor. At Guo's request, Emperor Zhaozong also allowed him to change his name back to Cheng Rui. Zizhi Tongjian, vol. 257.
As the result of the Wutai campaign, Cheng seized control of the Yun'an salt mines (which, in peaceful times, would have been under the control of the imperial government's directorate of salt and iron monopolies). He was therefore able to enrich his circuit and build up an army of 50,000 men. In 897, Emperor Zhaozong bestowed the honorary chancellor title of Shizhong (侍中) on Cheng, and in 899 bestowed the honorary chancellor title of Zhongshu Ling (中書令) on Cheng. Zizhi Tongjian, vol. 261. Eventually, the imperial government also bestowed him with the titles of acting Taiwei (太尉, one of the Three Excellencies) and Prince of Shanggu. However, it was said that much of Cheng's excellence in governance was driven by his advisor He Yin (賀隱). He Yin was later replaced by Cheng's father-in-law, who was said to be pernicious and who even falsely accused Cheng's own sons, each of whom was killed by Cheng himself, leading to Cheng's not having any descendants. At some point, Cheng complained to the imperial government that the warlord Lei Man was occupying Li (澧州) and Lang (朗州) Prefectures (both in modern Changde, Hunan), both of which formerly belonged to Jingnan, and requested that those prefectures, which had been made into a separate Wuzhen Circuit (武貞) to accommodate Lei, be returned to Jingnan. The chancellor Xu Yanruo refused. When Xu was removed from his chancellor position in 900 and made the military governor of Qinghai Circuit (清海, headquartered in modern Guangzhou, Guangdong) and went through Jiangling to his post, Cheng held a feast for him but again brought up the Lei matter at the feast. Xu responded that as Cheng viewed himself as comparable to Duke Huan of Qi and Duke Wen of Jin, he should have taken care of Lei himself rather than complain to the imperial government, and this embarrassed Cheng. Zizhi Tongjian, vol. 262.
As Cheng's fleet progressed, Ma's officer Xu Dexun and Lei's officer Ouyang Si (歐陽思) jointly launched a surprise attack on Jiangling, capturing it. They pillaged the city of its population and wealth before withdrawing. When the news of Jiangling's being plundered reached Cheng's fleet, the soldiers, most of whom lost their families and homes, lost their morale. Meanwhile, Li Shenfu, hearing of Cheng's impending arrival, took initiative and attacked Cheng's fleet first. The Jingnan fleet collapsed, and Cheng jumped into the river to flee but drowned. In 906, at Zhu's request, Emperor Zhaozong allowed Zhu to build temples dedicated to Cheng and Du (who was, after Cheng's defeat, captured and executed by Yang). History of the Five Dynasties, vol. 17.
Early rule
Late rule
Defeat and death
Notes
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