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 Hui of Han
After Liu Bang's victory and self-declaration as the emperor (later known as Emperor Gao), thus establishing the Han Dynasty, in 202 BC, he made his wife empress and Liu Ying, as his proper heir, crown prince. Thus, Liu Ying became the first crown prince in Chinese imperial history. Under the title of Ying Taizi ("Crown Prince Ying"), he was considered to be kind and tolerant, characteristics that Emperor Gao did not like. Rather, he favored his young son Liu Ruyi, whom he considered to be more like him and whose mother, Consort Qi, was his favorite concubine. With the support of the officials, however, Prince Ying's status as heir survived despite Consort Qi's machinations.