The crown prince is the monarch, and the prince and the county king are knighthoods and lieutenants. It is clear at a glance who is nobler than the monarch and subjects. The prince is the future Chu Jun, and the kings of princes and counties are the uncles and brothers of the emperor, which is the so-called royal collateral. According to the patriarchal clan system, the prince is big, and the prince and the county king are small.

Before the Han Dynasty and the Han Dynasty, the emperor and vassal Chu Jun were called princes, but the crown prince was called the crown prince. Later, the warlord Chu Jun was called the prince, and the prince became a special name for the heir to the throne. And its position in the ruling and opposition is second only to the emperor, and one person is above ten thousand people, and it has great real power to supervise the country and assist the government (of course, in the private family of the royal family, its position is still lower than that of the elders such as the queen mother)

As early as the Han Dynasty, the emperor's uncles and brothers began to be crowned as kings, while the titles of prince and county king only gradually appeared in the Wei and Jin Dynasties.

At that time, except Chu Jun, all the other sons and brothers of the emperor were made princes, while the grandson and hero of the emperor were made county kings. In the Tang Dynasty, the most obvious feature to distinguish the prince from the county king was to look at the number of words in his title-all the words were prince, such as King Qin, King Qi, King Yue and Hanwang. The two words are county kings, such as Fenyang King, Hengshan King and Qiyang King.

The situation in the Ming dynasty was similar, and the princes all took the fief as the number, all of which were one word.

In the Qing Dynasty, the system of nobility knighthood was further tightened and stricter. The prince is the highest-ranking aristocrat, and Yong Zhengdi no longer publicly awarded the title of Chu Jun, so the title of "Crown Prince" has existed in name only. Under the prince of Qing dynasty, there were county kings, Baylor, Beizi, etc., and the status of county kings was lower than that of princes. Except the hereditary iron hat king, all titles should be downgraded to the title of Lord.

It is worth mentioning that in the ancient times when the tributary system was implemented, the King of Korea was the son and nephew of the emperor, but he could enjoy the crown of the prince. But its actual status is still only equivalent to the county king.