Song Xian

Song Xian is a military officer who served under Lu Bu. In 198, when rival warlord Cao Cao besieged Lu Bu in Xia Pi, Song Xian and his colleagues Hou Cheng and Wei Xu kidnapped Lu Bu's chief advisor Chen Gong and defected. Lu Bu was soon captured and executed as well. However, historically it was unknown what happened to Song Xian 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. 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 reported 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 Wei Xu 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. Before then, however, when Lu Bu was being observed, he asked to his betrayers, "Did I not treat you well? How could you betray me?" Song Xian responded, "You listened only to your women, not to your commanders. Is that what you mean by 'treat well'?" Lu Bu was silent.

Song Xian was later killed in a duel by Yan Liang.