Emperor Xian of Han
Cao Cao died on 15 March 220. His son and successor, Cao Pi, soon forced Emperor Xian to abdicate the throne in favour of himself, ending the Han dynasty. Cao Pi established a new state known as Cao Wei (sometimes known inaccurately as the Kingdom of Wei), and he granted Emperor Xian a noble title – Duke of Shanyang (山陽公). The former Emperor Xian died in 234 and was buried with honours befitting an emperor, using Han ceremonies, and the then emperor of Wei, Cao Rui, was one of the mourners. As Emperor Xian's crown prince was already dead, his grandson Liu Kang (劉康) inherited his dukedom, which lasted for 75 more years and two more dukes, Liu Jin (劉瑾) and Liu Qiu (劉秋), until the line was exterminated by invading Xiongnu tribes in about 309, during the Jin dynasty. This practice of an emperor conferring hereditary nobility on his predecessor, from whom he usurped the throne, was known as "er wang san ke" (二王三恪).
Xi Zuochi
Even the work's title, naming the Han and Jin dynasties without mention of the intervening Wei, is indicative of its primary thrust. The annals began with Emperor Guangwu of Han, restorer of the dynasty and founding emperor of the Eastern (or Later) Han, and continued through to the time of Emperor Min of Jin, final emperor of the Western Jin (i.e. years CE 25–317). Although his primary goal was to argue that ritual abdication was insufficient to achieve a legitimate mandate, Xi Zuochi's aims had the secondary effect of legitimating Liu Bei's Shu Han as the legitimate successor to the Han dynasty, which he displayed by employing the Shu Han calendar, going so far as to use dynastic founder Emperor Wu of Jin's taboo personal name in recording the events of Liu Shan's final regnal year. Late in life, in his final memorial to the throne, Xi Zuochi laid bare his rationale and method behind delegitimating Wei while conducting the balancing act of considering the Jin dynasty still legitimate.