List of emperors of the Han dynasty
The Han dynasty was founded by the peasant rebel leader (Liu Bang), known posthumously as Emperor Gao ("r". 202 –195 BC) or Gaodi. The longest reigning emperor of the dynasty was Emperor Wu ("r". 141–87 BC), or Wudi, who reigned for 54 years. The dynasty was briefly interrupted by the Xin dynasty of the former regent Wang Mang, but he was overthrown in 23 AD and the Han dynasty was reestablished by Liu Xiu, known posthumously as Emperor Guangwu (r. 25–57 AD), or Guangwu Di. The last Han emperor, Emperor Xian ("r". 189–220 AD), was a puppet monarch of Chancellor Cao Cao (155–220 AD), who dominated the court and was made King of Wei. In 220 AD, Cao's son Pi usurped the throne as Emperor Wen of Wei ("r". 220–226 AD) and ended the Han dynasty.
Cao Jun (Duke of Fan)
In 220, Cao Jun'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 Jun with the posthumous title "Duke An of Fan" (樊安公). Cao Jun's son and heir, Cao Kang, became the Duke of Fan. In 222, Cao Kang's title was changed to "Duke of Ji" (薊公), and to "Duke of Tunliu" (屯留公) in 223. Cao Kang died in 237 during the reign of Cao Pi's successor, Cao Rui, and was posthumously honoured as "Duke Ding" (定公). He was succeeded by his son, Cao Chen (曹諶), as the Duke of Tunliu. Throughout the reigns of the subsequent Wei emperors, the number of taxable households in Cao Chen's dukedom increased until it reached 1,900.