耿精忠
After the Qing takeover of China in 1644, large parts of the south and west were given as fiefs to three Ming generals who aided the Qing; in 1673 the three feudatories were controlled by Wu Sangui, Geng Jingzhong, and Shang Zhixin. Going against the advice of most of his advisors, Kangxi attempted to force the feudal princes to give up their lands and retire to Manchuria, sparking a rebellion that lasted eight years. For years afterwards Kangxi ruminated on his mistakes and blamed himself in part for the loss of life during the revolt.