Zheng Quan 鄭泉

When Liu Bei led his army to attack Wu, Sun Quan made Lu Xun Area Commander to resist him. In the 1st year of Huangwu (222), Lu Xun fought from the 1st month through the intercalary month and crushed the Shu army, and Liu Bei fled, barely escaping with his life. Records, Wu 2 §39 · 41

Sun Quan outwardly pretended to serve Wei, but at heart he was not sincere, and when Wei demanded a covenant and that he send a son as a hostage, he declined and did not accept. In the 9th month, in autumn, of that year, Wei sent Cao Xiu, Zhang Liao and Zang Ba out to Dongkou and Cao Ren out to Ruxu, and had Cao Zhen, Xiahou Shang, Zhang He and Xu Huang besiege Nan Commandery. Sun Quan had Lü Fan and others resist Cao Xiu and the others with the fleet, and, using humble words, submitted a letter asking to be allowed to mend his ways. Emperor Wen of Wei (Cao Pi) replied that if Sun Quan's son Sun Deng arrived in the morning, he would recall his troops that evening. Sun Quan then changed the era name and held a defensive line along the Yangtze. In the 11th month, in winter, a great wind blew and several thousand of the soldiers of Lü Fan and the others drowned. Records, Wu 2 §42–44 · 46–47

In the 12th month, Sun Quan sent Zheng Quan, Grand Palace Grandee, on a courtesy mission to Liu Bei at Baidi, and relations were at last resumed. Sun Quan, however, still kept up exchanges with Emperor Wen of Wei as well, and broke them off only in the year after next. Records, Wu 2 §47–48

In the Biography of the First Sovereign, under the 10th month, in winter, of the same year, it is recorded that Sun Quan, hearing that Liu Bei was staying at Baidi, was greatly alarmed and sent an envoy to ask for peace, and that Liu Bei agreed and sent Zong Wei, Grand Palace Grandee, to deliver his reply. The Biography of the First Sovereign does not give the name of this envoy. Records, Shu 2 §70 · 72

In Chen Shou's main text Zheng Quan appears only in this one place in the Biography of the Lord of Wu, and his courtesy name, origin, birth and death, and any other deeds are not recorded. Records, Wu 2 §47