Chinese emperors family tree (early)
Emperor Xian, the last emperor of the Han dynasty, was a descendant of the first emperor Liu Bang. Lasting for over 400 years (the first to last for more than a century), the Han Dynasty is regarded as one of the golden ages of Chinese history. The Han Dynasty was interrupted by the reign of the usurper Wang Mang, who declared the Xin dynasty (9–23 AD); on this basis, the Han Dynasty is generally divided into the Western Han (206 BC – 9 AD and 23–25 AD) and the Eastern Han (25–220 AD). The rulers of the Shu Han, one of the three successor states to the Han Dynasty during the Three Kingdoms period, were descended from the Han imperial family, and considered themselves a continuation of the Han Dynasty; they are included below.
Cao Zizheng
In 220, Cao Zizheng's half-brother Cao Pi became the first emperor of the Cao Wei state after usurping the throne from Emperor Xian, the last emperor of the Han dynasty. The following year, he honoured Cao Zizheng with the posthumous title "Duke Dai of Mei" (郿戴公), and ordered Cao Fan (曹範), a son of Cao Ju, to be Cao Zizheng's heir. In 222, Cao Pi enfeoffed Cao Fan as the Marquis of Pingshi (平氏侯), but changed his title to Marquis of Chengwu (成武侯) in the following year. In 229, Cao Pi's successor, Cao Rui, promoted Cao Fan from a marquis to a duke. Cao Fan died in 235 without a son to succeed him, and was posthumously honoured as "Duke Dao" (悼公). In 236, Cao Rui ordered Cao Chan (曹闡), Cao Fan's younger brother, to be Cao Fan's heir. Cao Chan thus became the new Duke of Mei (郿公). Throughout the reigns of the subsequent Wei emperors, the number of taxable households in Cao Chan's dukedom increased until it reached 1,800.