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).
He Jin
He Jin () (died 22 September 189), courtesy name Suigao, was a military general and regent of the late Eastern Han dynasty of China. He was an elder half-brother of Empress He, the empress consort of Emperor Ling, and a maternal uncle of Emperor Shao. In 189, he and his sister shared power as regents when the young Emperor Shao was put on the throne following Emperor Ling's death. During the time, the conflict between He Jin and the influential eunuch faction intensified. The eunuch faction lured He Jin into a trap in the imperial palace and assassinated him. While He Jin's subordinates slaughtered the eunuch faction in revenge, the warlord Dong Zhuo took advantage of the power vacuum to enter the imperial capital Luoyang and seize control of the Han central government. The subsequent breakdown of central command brought forth the beginning of massive civil wars which led to the end of the Han dynasty and the start of the Three Kingdoms period.