In 189 CE Dong Zhuo marched on Luoyang, deposed the child emperor, poisoned Empress Dowager He, and installed the puppet Emperor Xian. His cruelty triggered the coalition war against him led by Yuan Shao. He was assassinated in 192 by his own bodyguard Lü Bu, manipulated by Wang Yun using the beauty Diaochan (
貂蝉).