The emperors in ancient legends in China are: Emperor Yan, Huangdi, Shao Hao, Zhuan Xu, Zhuan Xu, Di Ku, Imperial System, Yao and Shun.
Broadly speaking: from the time before Qin unified China (22 1) to ancient times.
Including primitive society (from ancient times to the legendary Yao, Shun and Yu period), slave society (Xia, Shang, Zhou, Spring and Autumn Period) and the Warring States period when feudal society was established.
Narrow sense: Spring and Autumn Period and Warring States Period before Qin unified the world.
"Jude said Qin Xian, that is, before the book was burned". There are not many literary works left before, mainly during the Spring and Autumn Period and the Warring States Period, especially during the Warring States Period.
References:
http://www . to catch . info/zh/% E4 % B8 % 8A % E5 % 8F % A4 % E6 % 99% 82% E4 % BB % a3 . htm