Jia Xu (147-August 11, 223), also known as Wenhe, was born in Guzang, Liangzhou (now Liangzhou District, Wuwei City, Gansu Province). From the late Eastern Han Dynasty to the early years of the Three Kingdoms, he was a famous counselor and military strategist, and a hero of the founding of the Cao Wei Dynasty. He was originally a general of Dong Zhuo. After Dong Zhuo's death, he offered advice to Li Jue and Guo Si to counterattack Chang 'an. After Li Jue and others failed, they became Zhang Xiu's advisers. Zhang Xiu used his tactics to defeat Cao Cao twice. Before the Battle of Guandu, he advised Zhang Xiu to surrender to Cao Cao.