The Western Han Dynasty (202 -9 BC) is an ancient dynasty in China, which is called the Han Dynasty together with the Eastern Han Dynasty. In the first 206 years, Liu Bang was enfeoffed as Hanwang by the overlord of the Western Chu Dynasty. Then, after four years of Chu-Han War, Liu Bang finally unified the world in the first 202 years, claiming the title of emperor and making Chang 'an its capital. History is called the Western Han Dynasty. Xiang Yu named Liu Bang as the "Forty-one County of Bashu Hanzhong" and Hanzhong as the "Hanwang" under his rule. When he became emperor, he named the country the name of the dynasty. Chang 'an, the capital of Liu Bang, is located in the west of Luoyang, the capital of Han Dynasty established by Liu Xiu. For the sake of distinction, it was called "Western Han Dynasty" in history, and sometimes it was called "Xijing" according to the relative position between the capital and the Han Dynasty built by Liu Xiu. The Han Dynasty established by Liu Bang preceded the Han Dynasty established by Liu Xiu, so it was also called "pre-Han Dynasty" in history.