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 Ping of Han
Emperor Ping (9 BC – 3 February 6 CE) was an emperor of the Chinese Han Dynasty from 1 BC to AD 5. After Emperor Ai died childless, the throne was passed to his cousin Emperor Ping—then a child of eight years old. Wang Mang was appointed regent by the Grand Empress Dowager Wang. Dissatisfied with his father's dictatorial regency, in AD 3, Wang's son Wang Yu (王宇) conspired with Emperor Ping's maternal uncles of the Wei clan against Wang, but after they were discovered, Wang had not only Wang Yu and the Weis (except Consort Wei) put to death, but also used this opportunity to accuse many actual or potential political enemies as being part of the conspiracy and to execute or exile them. From here onwards, the Han Dynasty existed only in name. Furthermore, Wang Mang also designated his daughter as the empress consort to Emperor Ping to codify his legitimacy to power. Emperor Ping was allegedly poisoned by Wang Mang after reigning less than six years, because Wang was concerned that he would avenge his uncles, and his successor, the infant Emperor Ruzi, would be chosen by none other than Wang Mang himself.