Dong Zhuo
Dong Zhuo had been a successful warrior and general since his youth. However, he was defeated by Yellow Scarves rebels in 184 and was demoted. After the death of Emperor Ling, the eunuchs kidnapped the young follower Liu Bian and his brother Liu Xie. Dong Zhuo freed them and intimidated the kidnappers so they committed suicide by drowning in the Yellow River. Dong then brought the emperor and his brother back to the capital Luoyang and seized control over the court. Because Liu Bian seemed too stupid to him, Dong deposed him and made his brother Liu Xie emperor instead (Emperor Xian). In 190 he poisoned Liu Bian.