Kings of the Han dynasty
The kings from other dynasties (, "yìxìng wáng") were mostly remnants of the rebellion against the Qin dynasty. Following the Dazexiang Uprising, many noblemen rose in rebellion. Heirs, pretenders, and warlords called themselves "kings" and claimed sovereignty as continuations of the six states previously suppressed by Qin. Among these, Chu was the most powerful. However, its rightful ruler Huai II was assassinated on the orders of the warlord Xiang Yu and the 18 Kingdoms Xiang had formed rose in rebellion against him. Liu Bang, king of Han, ultimately defeated Chu and established the new Han dynasty. The kings who had sided with him were then permitted to maintain their titles and lands. A few other kingdoms were also formed by Liu Bang for generals and favorites.
Emperor Gaozu of Han
In 202 BCE, Liu Bang emerged victorious following the Battle of Gaixia, unified most of China under his control, and established the Han dynasty with himself as the founding emperor. During his reign, Liu Bang reduced taxes and corvée, promoted Confucianism, and suppressed revolts by the lords of non-Liu vassal states, among many other actions. He also initiated the policy of "heqin" to maintain a "de jure" peace between the Han Empire and the Xiongnu after losing the Battle of Baideng in 200 BCE. He died in 195 BCE and was succeeded by his son, Liu Ying.