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.
Empress Lü
In the autumn of 203 BC, Liu Bang and Xiang Yu came to a temporary reconciliation, known as the Treaty of Hong Canal, which divided China into west and east under their Han and Western Chu domains respectively. As part of their agreement, Xiang Yu released Lü Zhi and Liu Bang's family and returned them to Liu. Lü Zhi was given the title of "Queen Consort of Han" (漢王妃). Liu Bang later renounced the truce and attacked Xiang Yu, eventually defeating the latter at the Battle of Gaixia in 202 BC and unifying China under his rule. Liu Bang proclaimed himself Emperor of China and established the Han Dynasty. He instated Lü Zhi as his empress and their son Liu Ying as crown prince.