Gongsun Zan
In 193, armed conflict broke out between the northern warlords Liu Yu and Gongsun Zan. Liu Yu strongly opposed warfare while Gongsun Zan continuously waged war against Yuan Shao. Liu Yu and Gongsun Zan made accusations against each other in their respective memorials to Emperor Xian. Eventually, Liu Yu was unable to tolerate Gongsun Zan and attacked the latter, but was defeated and killed.