There is a classic story about Emperor Kangxi of the Qing Dynasty "Nine sons seized the office". Nine sons seized the office, which refers to the historical event that the sons of Emperor Kangxi of the Qing Dynasty competed for the throne. At that time, Kangxi had 24 sons alive, 9 of whom participated in the struggle for the throne. The nine sons are: eldest brother Yi Yin, second brother Yi Yin, third brother Yin Zhi, fourth brother Yin Zhen, eighth brother Yi Yin, Jiu Ge Yi Yin and tenth brother Yi Yin? May 13 Huang Hongfa, May 14 Yin Gui. Finally, Yin Zhen won in May and succeeded to the throne after the death of Emperor Kangxi.

According to unofficial history's records, Kangxi wrote in the testamentary edict of succession that "the fourteenth son" was passed on, and later it was changed to "the fourth son" in May, so he became emperor and became Yongzheng in May. But this is not the official history, please refer carefully.