Xiang Yu’s hometown is in Xuzhou, to the east. Why is he called the Overlord of Western Chu?

When the Zhou Dynasty was established, the Emperor of Zhou divided the world into feudal lords. There are five levels of princes - duke, marquis, earl, viscount and baron. Each "lord" has his own "country" and is a king. The Emperor of Zhou is the master of the world, which of course includes all countries. States may be large or small, and kings may be high or low, but there is no subordinate relationship between kings. In the Spring and Autumn Period, wars often broke out among the princes. At this time, the Emperor of Zhou was no longer able to restrain the princes. He was still the "Emperor" in name only. Some weak countries had to rely on powerful countries to protect themselves. The kings of powerful countries through so-called "alliances" "Association" and gained the right to issue orders to weak countries. A king who can issue orders to many countries is called an "overlord".

Qin Shihuang called himself "emperor" and was "on the same level" as the emperor. Later, when the world was in chaos, Qin Shihuang's grandson Ziying no longer dared to call himself "Emperor", so he restored the title of King and was called "King of Qin". After the fall of Qin, Xiang Yu thought he could control the world and returned home in glory without destroying Liu Bang and the armed forces of Qi, Yan, Zhao and other places. Xiang Yu respected King Huai of Chu as the "Emperor of Righteousness", "righteousness" means "false", which means "honorary emperor" or "honorary emperor", and he named himself "Overlord of Western Chu", which means "those in the western part of Chu State can manage other kings" King", and also named 18 kings.

However, many people with military power did not get the throne, and not only gave the Kingdom of Abundance to Liu Bang, but also gave the Hanzhong Plain to Liu Bang.