Gu Cheng (fl.232 to 240s), courtesy name Zizhi, was a military general of the state of Eastern Wu during the Three Kingdoms period of China.
[b] Gu Cheng started his career in the Jiahe era (232–238) of Sun Quan's reign when he, along with his maternal uncle Lu Mao, were offered positions in the Eastern Wu government.
[4] Gu Cheng was later reassigned to the position of commandant of the West Section of Wu Commandery (吳郡西部都尉).
[5] In the summer of 241, the Wu general Quan Cong led Wu forces into battle at Quebei (芍陂; south of present-day Shou County, Anhui) against Wei forces led by Wang Ling.
Gu Cheng and his friend Zhang Xiu, who were serving in the Wu army at the time, led their units to resist the Wei forces and managed to halt their advance.
[11] During an imperial court session, Sun Quan ordered Gu Tan to publicly apologise for the mistake.
However, Gu Tan refused to apologise and he told Sun Quan: "Your Majesty, how can you let baseless accusations have their way?