Original: As one of the oldest cities in Chinese history , Xi'an is one of the Four Great Ancient Capitals of China because it has been the capital ( under various names ) of some of the most important dynasties in Chinese history , including the Zhou , Qin , Han , the Sui , and Tang dynasties .
Simplified: In past China it was the capital of 13 dynasties , including the Zhou dynasty , the dynasty , the Han dynasty , the Sui dynasty , and the Tang dynasty .