This is just a historical period.
During the Spring and Autumn Period, there were the Five Hegemons of the Spring and Autumn Period.
During the Warring States Period, there were the Seven Hegemons of the Warring States Period.
The Spring and Autumn Period The period is the Western Zhou Dynasty, and the Warring States Period is the Eastern Zhou Dynasty.
The two together constituted the entire Zhou Dynasty, but because the Emperor Zhou had no way to control the vassal states in the world,
the vassal states could instead demonstrate against the Emperor, so it was not called the Western Zhou Dynasty. Eastern Zhou or something.