Guo Si
In 195, when internal conflict broke out between Li Jue and Guo Si, the former took Emperor Xian hostage while the latter took the emperor's subjects hostage to threaten each other. During this time, Yang Feng and Song Guo (宋果), another of Li Jue's subordinates, plotted to assassinate their superior but failed and were forced to leave Chang'an. After three months, Zhang Ji managed to persuade Li Jue and Guo Si to make peace, and allow Emperor Xian to return to the old imperial capital, Luoyang.