More noble than the king are the five emperors, Huang San is more noble than the five emperors, and Tai Huang is the noblest in Huang San, so he should be Qin Shihuang and Tai Huang.
However, Qin Shihuang thought that Tai Huang was still not loud enough, so he borrowed a sentence from Huang Sanhe and Five Emperors and called himself the emperor. This is the origin of the title of "Emperor". Therefore, "Emperor" has always been called the title of supreme ruler in China's ancient feudal history of more than two thousand years.
In the official system, Wang first appeared in the Yin and Zhou Dynasties. At that time, Wang was a title of respect for the rulers at that time, such as,. Why is the son of heaven called king? According to ancient books, "Wang, there is a king in the world, and the emperor and the king are also." In other words, only those who are in charge of the world can be king.
During the Qin Shihuang period, after the reunification of the country, in order to manage state affairs and highlight the majesty of the son of heaven, the title of the son of heaven was no longer used as the title of the son of heaven, but changed to the title of emperor, and rulers of all previous dynasties continued to use the title of emperor.
The emperor is the one who gives life to all things, and the emperor is the subject of living things. The emperor symbolizes heaven, light, the source that gives life to all things and gives birth and reproduction.
From then on, the emperor became the title of supreme ruler until the demise of the Qing Dynasty. From this point of view, Emperor Wang Gai was king because the Zhou royal family was weak at that time, and the governors rebelled. The scene was in chaos and there were kings everywhere. After Qin Shihuang unified the whole country, in order to show the difference, he changed the son of heaven to emperor, in order to strengthen centralized rule and show the majesty of the son of heaven.