Qin Shi Huang

The Chinese tyrant who committed ethnic cleansing or cultural ethnic cleansing to multiple non-Qin tribes, such as the Yue (Viet) tribes, Austroasiatic tribes, and Hmong tribes, to "unify" them under the Qin dynasty. Also, Qin oppressed people to death while building the Great Wall of China to keep out northern invaders, murdered many educated scholars out of paranoia, burned historical books to hide his atrocities, attempted to murder his men if they don’t find the elixir for him to become “immortal”, etc. Joyfully, Qin got poisoned to death, even though it was too late that certain tribes were already absorbed into the Han Chinese rule either forcefully or willingly when the Han dynasty successfully conquered indigenous lands by expanding southwards after 200 B.C.