Guo Si
In 196, the warlord Cao Cao led his forces into the ruins of the old imperial capital, Luoyang, where he met Emperor Xian, the figurehead Han emperor who had been held hostage consecutively by the warlords Dong Zhuo, Li Jue and Guo Si since his coronation in 189. He had only escaped from Chang'an in late 195 after being held hostage by Li Jue and Guo Si since Dong Zhuo's death in 192. Cao Cao treated the emperor respectfully and escorted him from Luoyang to his own base in Xu (許; present-day Xuchang, Henan), which became the new imperial capital.