The earliest appellation Emperor was a general designation of Three Kings and Five Emperors. Three Kings were referred to Emperor of Heaven, Emperor of Earth and Emperor of Human, the three ancient emperors in Chinese legends. Originally, Emperor was referred to Emperor of Heaven, the sovereign ruler of everything on earth. Later on, after wars occurred between many states, their rulers called themselves emperor, such as Western Emperor, Eastern Emperor, Mid Emperor, Northern Emperor, and so on, which made the Emperors in the heaven come down into the world and thus became a honorific title in the world. (There was another saying that Five Emperors were referred to the Yellow Emperor, Emperor Yan, Emperor Ciyou, etc. in the tribe age.), Read detailed information, please go to the following links.
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