End of the Han dynasty
The end of the Han dynasty refers to the period of Chinese history from 189 to 220 AD, which roughly coincides with the tumultuous reign of the Han dynasty's last ruler, Emperor Xian. During this period, the country was thrown into turmoil by the Yellow Turban Rebellion (184–205). Meanwhile, the Han Empire's institutions were destroyed by the warlord Dong Zhuo, and fractured into regional regimes ruled by various warlords, some of whom were nobles and officials of the Han imperial court. Eventually, one of those warlords, Cao Cao, was able to gradually reunify the empire, ostensibly under Emperor Xian's rule, but the empire was actually controlled by Cao Cao himself. Cao Cao's efforts to completely reunite the Han empire were rebuffed at the Battle of Red Cliffs in 208 / 209, when his armies were defeated by the allied forces of Sun Quan and Liu Bei. The Han dynasty formally ended in 220 when Cao Cao's son and heir, Cao Pi, pressured Emperor Xian into abdicating in his favour. Cao Pi became the emperor of a new state, Cao Wei. A year later, in response to Cao Pi's usurpation of the Han throne, Liu Bei declared himself emperor of Shu Han; and in 229, Sun Quan followed suit, declaring himself emperor of Eastern Wu. The period from Emperor Xian's abdication in 220 to the partial reunification of China under the Jin dynasty in 265 was known as the Three Kingdoms era in Chinese history.
Cheng Yu
Cheng Yu (141 – December 220), originally named Cheng Li, courtesy name Zhongde, was an official who lived during the late Eastern Han dynasty of China. He was an adviser to Cao Cao, the warlord who became the "de facto" head of the Han central government during that period. He died in December 220 – a few months after Cao Cao's son, Cao Pi, usurped the throne from Emperor Xian (the last Han emperor) and established the state of Cao Wei, an event marking the start of the Three Kingdoms period in China. Cheng Yu was described as a tall man (approximately 1.91 metres) with a beautiful long beard. He was from Dong'e County in present-day Shandong. He was best known in his time for his abnormal approach to cope with a shortage of grain: instead of sending hostages to Cao Cao's rival, Yuan Shao, in exchange for food supplies, he advised Cao Cao to feed his army with human flesh. He was also noted for his expertise in military tactics, which helped Cao Cao defeat Yuan Shao at the Battle of Guandu in 200 and consolidate control over northern China. It is widely agreed that his numerous contributions laid the foundation of the Cao Wei state; the reason he was not promoted to the rank of a duke was only because of his aforementioned strategy to cope with the food shortage in Yan Province. After Cheng Yu's death, Cao Pi honoured him with the posthumous title "Marquis Su", meaning "solemn marquis".