Prince supervisor introduced

Prince's prison is an important political system in Tang Dynasty. From the ninth year of Wude in the Tang Dynasty, Li Shimin supervised the country as a prince until the end of the Tang Dynasty, and this system was implemented for nearly 300 years. The prince supervises the country, and the prince acts as an agent for state affairs. When the emperor is temporarily unable to personally take charge of the country for some reason, the prince will take charge of the country. During the period when the prince supervised the country, the operation mode of the central administration also had corresponding procedural changes.