Jia Xu is also recorded as Jia Si (賈嗣) in the Jinshu.
Wei Ping and Jia Xu were Wei officers.
In 220, soon after Cao Cao’s (曹操) death, many commanderies of Liang Province rose up in rebellion. Hao Zhao (郝昭) and Wei Ping were sent to assist the commandery forces in quelling the rebels.
They stationed themselves in Jincheng Commandery with its Grand Administrator, Su Ze (蘇則). However, they had received an imperial decree that did not allow them to cross the Yellow River, preventing them from assisting the other commanderies. Three barbarian tribes of Wuwei Commandery rose up and the Grand Administrator of Wuwei, Guanqiu Xing (毌丘興), urgently requested aid from Su Ze.
Su Ze held a meeting with Hao Zhao, Wei Ping, and several Qiang leaders, and he said,
“Now the bandits though are flourishing, however, they all are newly gathered, some were coerced to follow, and not necessarily of the same art; taking advantage of quarrel to strike them, the good and evil will certainly separate, the separating will join us, we will increase and they will decrease. We will both benefit from the solidity of increasing numbers, and moreover have the momentum of multi-fold energy, leading to advance and suppress, defeating them is certain. If we wait for the main army, waiting days and drawing out for long, the good people will not return, certainly join with the evil, and when good and evil are joined, the power is difficult to suddenly separate. Though there is Imperial Order command, if violating is in accord with expedience, usurping it is permissible.”
Convinced by Su Ze’s words, Hao Zhao and Wei Ping went to Guanqiu Xing’s aid. The three barbarian tribes surrendered, and the Wei forces continued west to save the other commanderies, and eventually, the rebellion was subdued.
In 231, Zhuge Liang (諸葛亮) led an assault on Mount Qi and Shanggui County in Tianshui Commandery. Defending Mount Qi were Jia Xu and Wei Ping, who became completely surrounded by the Shu forces.
Sima Yi (司馬懿) left Guo Huai (郭淮), Fei Yao (費曜), and Dai Ling (戴陵) along with 4,000 men to defend Shanggui while he went to Mount Qi. Zhuge Liang acted quickly and defeated the three generals defending Shanggui, making Sima Yi turn around and go back. Niu Jin (牛金) was sent with a small cavalry detachment to Mount Qi to aid the two officers there.
As Sima Yi returned to Shanggui, Zhuge Liang’s forces retreated to Lu Castle without a fight and began to fortify their position on the hills. Sima Yi set up his camp on a nearby mountain, but looking at the formidable defense of Zhuge Liang, he did not want to risk an attack. Jia Xu and Wei Ping wished to give battle and requested many times, saying to Sima Yi,
“Our lord is fearful of Shu as if they are a tiger, what will you do if you become heaven’s laughingstock?”
Falling under the pressure, Sima Yi ordered Zhang He (張郃) to attack Wang Ping (何平) further south, while he led the main body of troops to Lu Castle. Gao Xiang (高翔), Wei Yan (魏延), and Wu Ban (吳班) sallied out of Lu Castle and defeated Sima Yi, the Wei forces losing around 8,000 soldiers in the battle, along with a trove of supplies. Zhang He also could not make any progress against Wang Ping and retreated.
Wei Ping and Jia Xu do not make any further appearances.
SGZ 16, 35; ZZTJ 69, 72; JS 1
Translation of Su Ze's quote was taken from threestates.com. It can be found here: https://threestatesrecords.com/2022/02/19/16-2-su-ze/