In ancient times, the captaincy was the highest local military and political chief, who held the appointment and removal of other officials and the power of life and death of others. Stronger vassals will also establish their own countries among the countries, threatening the rule of the central government. The captaincy is often the king of his own fief, and he has the final say here. Although the power of the central government is greater than that of the vassal king, the central government is too far away from the vassal king to manage the affairs of the vassal king at all. Historically, there have been many wars between local governors and central kings, and most of them were won by the central government. After all, the central government is recognized as a legitimate government in the world.

When Liu Bang founded the Han Dynasty, he created seven princes with different surnames. In fact, it is what people call a captaincy, even worse than a captaincy. However, all seven princes were finally wiped out by Liu Bang. Liu bang was afraid of their strength and that they would unite against the rule of the central government one day. Liu bang had to get rid of them one by one when they were young to minimize their own risks.

Later, Liu Bang made all his sons vassals everywhere. Liu Bang thinks that these people belong to his own family. How can he help the new king to govern the country? However, Liu Bang's judgment was wrong. Emotion is the most fragile thing in political struggle, which is a cruel and cold-blooded struggle. Emotions are worthless here and have no effect.

During the reign of Emperor Wen of Han Dynasty, he adopted the policy of reducing the number of vassals. Emperor Wen's policy of cutting vassals directly aroused the dissatisfaction of the princes, and finally the Seven Kingdoms Rebellion broke out. They are just a bunch of thugs. Emperor Wen of the Han Dynasty put down the rebellion of the captaincy with three strikes, five divisions and two divisions, which greatly weakened their power, strengthened centralization and reduced external threats.