In ancient China, it generally refers to the era before the summer. In the two river basins and Egypt, it generally refers to the historical era before 5000 BC. Because there was no direct written record at that time in ancient times, it was generally impossible to directly research the events or people that happened at that time. These events and people are usually fictional.
Huang San: Huangdi, Yan Di, Fuxi and Haotian: Yao, Shun, Yu, Zhuan Xu and Duyu. I hope it helps you. Thank you for your adoption.