In the thirty-first year of Hongwu, Zhu Yuanzhang, the Ming emperor, died, and his eldest son, Zhu Biao, died young. Because of work needs, he was transferred to Zhu Yunwen, the son of Zhu Biao. This incident aroused the dissatisfaction of the kings headed by Judy, the prince of Yan, and allowed him to cut down the princes to consolidate the throne. However, Judy stood up and sided with Jun Qing to defend the national disaster in Guo Jing. After four years of war, Judy finally occupied Nanjing and allowed him to disappear. This is the so-called Jingnan Change in history.
After Judy proclaimed herself emperor, she changed her name to Yongle. Because the first four years refused to recognize the title of Wen Jian, although Zhu Yuanzhang was dead, he still insisted on changing the name of those four years to 35 years, which was the year when Judy launched the Jingnan Revolution.
Extended data:
Follow-up to the change of Jingnan
After Judy proclaimed himself emperor, Wen Jian resumed the titles of Zhu Cong, king of Zhou, and Zhu Cong, king of Qi, on June 18th, four years (1402). Subsequently, the titles of Dai Wang Zhu Gui and Min Wang Zhu Kun were restored. In the first month of the first year of Yongle (1403), Ming Taizu made the four kings Zhou, Qi, Dai and Min governors.
On June 26th, Chengzu revoked the Xingzong Hall of Zhu Biao, the father of his, and renamed it Prince Wen Yi. On July 12, Cheng Zu reduced Zhu Yunwen's three younger brothers from prince to county king. In November, Zhu Biao's sons Zhu and Zhu were abolished and imprisoned in Fengyang, his hometown.
Judy started his army because he opposed the reduction of vassals in Wen Jian. In order to win the support of the kings, he also changed the imperial clan system to improve the rank of the imperial clan. For example, during the Hongwu period, the general of Zhenguo (the son of the county king) was divided into three categories: general Guo Fu, general Guo Feng, lieutenant of Zhenguo, lieutenant of Zhenguo, lieutenant of Guo Fu and lieutenant of Guo Feng.
And Cheng Zu "levied general Zhen Guo from one product, general Guo Fu from two products, general Guo Feng from three products, lieutenant Zhen Guo from four products, lieutenant Guo Fu from five products and lieutenant Guo Feng from six products".
However, because Judy herself seized power by armed means, in order to ensure the stability of the central government, after he ascended the throne, he first sealed the frontier fortress of Wang Gai in the mainland, and then gradually relieved the military power of the kings: in the first year of Yongle (1403), the guards and officials of the kings were replaced; In the fourth year of Yongle (1406), the bodyguard officer of the King of Qi was cut off and was soon abolished as Shu Ren.
In the sixth year of Yongle (1408), the king's bodyguard officer was cut; In the tenth year of Yongle (14 12), the Liao Wang Guards were cut; In the fifteenth year of Yongle (14 17), the king of the abandoned valley was Shu Ren; In the 19th year of Yongle (14 19), Zhou Wang saw that the situation was not good and offered to return the Guards.
Thirteen princes of Hongwu led the troops, and six guards of Yongle beheaded them. At the same time, a large number of experienced military officials were retained, the central government was strengthened, and the military strength contrast between the central government and the vassals was fundamentally changed.
Although Judy achieved Zhu Yunwen's goal in those years, he only solved the immediate problem and did not change the ancestral system. His son Hanwang Zhu He still set up three guards.
Baidu encyclopedia-the change of Jingnan