Our country has a long history and many dynasties. The first thing the founder of each dynasty has to do is to establish the name of the country (the name of the dynasty). The national title is the title of a country. The name is not justified, but the name is justified once the country's name is established, which means the birth of a new dynasty. Li Hu, the grandfather of Li Yuan, the great ancestor of the Tang Dynasty, assisted Zhou Dynasty with meritorious service and was named "Tang Guogong", and the title was passed to Li Yuan. After Taiyuan raised troops, Li Yuan was called "King of Tang", and later he deposed Yang You and established the Tang Dynasty. These are the names of the country. Just like the name of the country today.