After Li Shimin ascended the throne, he created the rule of Zhenguan and wrote a long song of Zhenguan. Li Shimin knew that his brothers were not the material to be emperor. For the sake of the dawn of the world, and also for his great cause, he was about to seize the throne, so Li Shimin launched the Xuanwu Gate Rebellion, killed his elder brother and ascended the throne as emperor. The Turkic soldiers attacked Chang'an. Li Shimin had great ambitions. For future development, he did not fight the Turks head-on. The strength of the Turks hit the Turks with one blow. From then on, the Tang Dynasty unified the world. After that, Li Shimin began to develop the lofty ideal of the people of all ethnic groups as one family, and was supported by the people of all ethnic groups. . On this road to prosperity and strength, Li Shimin devoted his whole life, implemented many reform plans, and led the people to the peak dynasty, attracting worship from all directions