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).
Liu Yao (warlord)
Liu Yao (157–198), courtesy name Zhengli, was a provincial governor and warlord who lived during the late Eastern Han dynasty of China. He was a descendant of Liu Fei, the eldest son of the Han dynasty's founding emperor, Liu Bang (Emperor Gao). When he was 18, he became famous after rescuing a relative who was being held hostage by bandits. He started his career in the Han civil service after being nominated as a "xiaolian", and was known for his incorruptibility. In 194, although he was appointed by the Han imperial court as the governor of Yang Province, he barely managed to gain a foothold over his jurisdiction because the warlord Yuan Shu controlled a large part of the territories around the Huai River region in Yang Province. In 195, conflict broke out between Liu Yao and Yuan Shu, who sent his ally Sun Ce to attack Liu Yao. Sun Ce defeated Liu Yao and forced him to retreat south into present-day Jiangxi, where Liu Yao defeated a minor warlord Ze Rong and died of illness shortly later.