The Expansion of the Han Dynasty (206 BC-220 AD) is one of the most significant events in Chinese history. The Han Dynasty was the second imperial dynasty of China and was founded by the rebel leader Liu Bang, who declared himself Emperor Gaozu of Han. It is considered to be one of the most successful Chinese dynasties, ruling for over four centuries. This period saw the expansion of the Chinese empire and the development of Chinese culture, art, and philosophy.