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Lü Bu, courtesy name Fengxian, was a Chinese military general, politician, and warlord who lived during the late Eastern Han dynasty of Imperial China. Originally a subordinate of a minor warlord Ding Yuan, he betrayed and murdered Ding Yuan and defected to Dong Zhuo, the warlord who controlled the Han central government in the early 190s. In 192, he turned against Dong Zhuo and killed him after being instigated by Wang Yun and Shisun Rui, but was later defeated and driven away by Dong Zhuo's followers. Wikipedia