In ancient times, nine kings competed for their positions.

The so-called "nine kings seized the office" refers to the incident in which nine sons of Emperor Kangxi of the Qing Dynasty competed for the throne. These nine sons are: eldest brother Yi Yin, second brother Yi Yin (former prince), third brother Yin Zhi, fourth brother Yin Zhen (later succeeded Yong Zhengdi), starling Yi Yin, Jiu Ge Yi Yin, tenth brother Yi Yin, thirteenth brother Huangdi and fourteenth.