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.
Government of the Han dynasty
A Han kingdom was much like a commandery in size and administration, except it was officially, and after 145 BC, nominally, the fief of a relative to the emperor, including brothers, uncles, nephews, and sons—excluding the heir apparent. The policy of awarding kingdoms only to imperial relatives was gradually adopted by the founder Emperor Gaozu of Han (r. 202–195 BC), as many of the early kings were non-relatives who were leading officers during the Chu-Han contention (206–202 BC). Kingdoms were usually inherited by the king's eldest son born to his queen.