The Xuanwu Gate Incident was a political incident that took place on July 28, the fourth year of Zhenguan in the Tang Dynasty. At that time, Emperor Taizong of the Tang Dynasty, Li Shimin, launched a coup and deposed his other son, the King of Qin, Li Zhi, and made his eldest son, Emperor Gaozong of the Tang Dynasty, Li Zhi, the Crown Prince. This coup was known as the "Xuanwu Gate Rebellion" and was a famous political event in the history of the Tang Dynasty. Story background: Li Shimin was one of the founding emperors of the Tang Dynasty. He had outstanding political and military skills. He had successfully led many battles and established a powerful Tang Dynasty. However, his eldest son, Li Zhi, inherited his throne but lacked the ability to govern the country, which led to political corruption and economic decline in the Tang Dynasty. In the fourth year of Zhenguan, Li Shimin believed that Li Zhi lacked the ability to govern the country and decided to launch a coup to abolish Li Zhi's eldest son, Li Longji, as the crown prince. Li Shimin sent his strategists to launch a coup in Xuanwu Gate. Li Zhi was killed and Li Longji was forced to abdicate. Li Shimin had successfully deposed Li Zhi and gained control of the political power of the Tang Dynasty. Impact and evaluation: The Xuanwu Gate Incident was an important political event in the history of the Tang Dynasty. It changed the political structure of the Tang Dynasty and also affected the future development of the Tang Dynasty. For Li Shimin, he had successfully realized his political ambition and became one of the famous emperors in Chinese history. However, he was also condemned and criticized for launching a coup. The above is the content and outline of the historical script "The Change of Xuanwu Gate". I hope it can help.