Wu Sangui

Wu Sangui, courtesy name Changbai (長白) or Changbo (長伯), was a Chinese military leader who played a key role in the fall of the Ming dynasty and the founding of the Qing dynasty. In Chinese folklore, Wu Sangui is regarded as a disreputable Han Chinese traitor for his defection over to the Manchu invaders, suppression of the Southern Ming resistance and execution of the Yongli Emperor. Wu eventually double-crossed both of his masters, the Ming and the Qing dynasties.