Guo Ziyi (697-78 1), a native of Zhengxian County (now Huazhou District, Weinan, Shaanxi Province), was a famous strategist, politician and strategist in the Tang Dynasty. In his early years, Guo Ziyi joined the army as a military attache, which made great contributions to Jiuyuan Prefecture, but it has never been reused. After the Anshi Rebellion broke out, Guo Ziyi was appointed as our envoy, led an army of diligent kings, recovered Hebei and Hedong, and worshipped the Ministry of War ministers and Shu Tong officials. In the second year of Zhide, Guo Ziyi and Li Chu, King of Guangping, recovered Chang 'an, Xijing and Luoyang, and added Stuart as lord protector. In the winter of the first year of Guangde, there was a conflict between the Tang court and Tang Jun, which led to the weak defense of Chang 'an. Cheng concealed the military situation and did not report it. Tubo took the opportunity to invade and attack Chang 'an when Chang 'an lacked defense. Tang Daizong launched Guo Ziyi War, and Guo Ziyi mobilized the army. Tubo occupied 10 days in Chang 'an. Tubo heard that Guo Ziyi was near Tang Jun and fled Chang 'an immediately. In 765 AD, an official of the Tang Dynasty, Pugu Huai 'en, rebelled and led Tubo and Uighur to invade. Guo Ziyi rode a horse to surrender to Uighur, and Tang Jun cavalry joined hands to Uighur and defeated Tubo. In the fourteenth year of Dali, he was honored as "Taizu" and was promoted to Taiwei and Zhongshuling. In the second year of Jianzhong, Guo Ziyi died of illness and was posthumously awarded a surname, posthumous title Zhongwu.