Emperor Yongzheng was the fourth son of Emperor Kangxi and was not originally the heir to the throne.
When Emperor Kangxi was in power, his eldest son should be the fourth Yinzhi, but the old four years were young and in poor physical condition, and Emperor Kangxi chose the eldest son Yinzhi as the heir in order to maintain stability, replacing the position of the fourth.
And Lao Ba Yinyu and Lao Jiu Yinyu are the sons born to Emperor Kangxi and different concubines, and they are ranked second.
When the Kangxi Emperor died in 1722, the dramatic events of the Nine Sons began to unfold. Lao Si Yinxi and his supporters tried to compete for the throne, believing that he should be the rightful heir.
At the same time, the mothers of Lao Ba Yinyu and Lao Jiu Yinyu, as well as their supporters, also took active action, hoping to make one of them the new emperor. Emperor Yongzheng's mother, Concubine Yi, also participated in the battle.
Emperor Yongzheng eventually succeeded in seizing the throne and became the fourth emperor of the Qing Dynasty.
He took strict measures to suppress the opposition of the Nine Sons, including deposing Lao Si Yinyu and exiled him to Xinjiang, while Lao Ba Yinyu and Lao Jiu Yinyu were imprisoned.
This incident not only affected the succession to the throne of the Kangxi Emperor, but also led to a series of political changes and changes in the court structure of the Qing Dynasty.
So why did Emperor Yongzheng choose to take the heir?
Some historians believe that the reason why the Yongzheng Emperor took the measure of nine sons to seize the heir was to ensure the stability of the throne on the one hand, and on the other hand, it was also related to his dissatisfaction with some political methods and policies in the Kangxi Emperor's era.
Yongzheng hoped to use reforms to strengthen the centralization of power, improve the efficiency of the government, and weaken the power of the Manchurian aristocracy. He may have thought that choosing his heir rather than the eldest son, predestined by the Kangxi Emperor, would help him achieve his political goals.