Wei Xu

Wei Xu is one of the three military officers who served and betrayed Lu Bu. When Cao Cao besieged Lu Bu in Xia Pi, Wei Xu and his colleagues, Hou Cheng and Song Xian, kidnapped Lu Bu's chief adviser Chen Gong and defected. Lu Bu was soon captured and executed as well. However, it was unknown what happened to Wei Xu afterward.

Romance of the Three Kingdoms
Wei Xu served as one of Lu Bu's top eight generals during the latter's initial invasion of Cao Cao's teritorry and homeland of Yanzhou. During Cao Cao's invasion of the Xiapi region, Wei Xu was sent with fellow officers Gao Shun and Hou Cheng to defend the western camp. When Lu Bu sent his daughter to marry Yuan Shu's son, Wei Xu and Song Xian were sent as an escort. Upon return, Wei Xu said that Zhang Fei had disguised as a brigand and stole the horses that he and Song Xian purchased, leading to a confrontation between Lu Bu and Liu Bei, to which Wei Xu was warded off by Zhang Fei.

He was also commanded to attack Yingchuan and Runan with Song Xian when Lu Bu discovered Liu Bei had been conspiring with Cao Cao.

Hou Cheng, one of Lu Bu's top generals, had been put to execution when he illegally made wine in celebration of a recent victory. Song Xian and Wei Xu convinced Lu Bu to call off the execution, so Hou Cheng was then put to fifty lashes. Later, the three conspired against their lord, accusing him of listening only to his women and not generals. Soon, Song Xian and Wei Xu tied up their lord during his sleep and surrendered to Cao Cao, who had Lu Bu executed.

Wei Xu was later killed by Yan Liang when the latter killed Song Xian in battle.