Wang Zhen (eunuch)
Wang Zhen (Chinese: 王振; pinyin: Wáng Zhèn) was a Chinese court eunuch. As tutor and advisor to the underage Zhengtong Emperor, Wang Zhen rose to become the first Ming dynasty eunuch to wield significant political power, exercising dictatorial control over the court during the 1440s. He was killed in the Tumu Crisis of 1449 when Mongol forces defeated the Ming army he had advised the emperor to lead personally, resulting in the emperor's capture.