The Three Kingdoms (AD 220–280) was the tripartite division of China between the states of Wei (), Shu (), and Wu (), following the Han dynasty and preceding the Jin dynasty. The term “Three Kingdoms” itself is something of a mistranslation, since each state was eventually headed not by a king, but by an emperor who claimed legitimate succession from the Han dynasty. Nevertheless, the term “Three Kingdoms” has become standard among sinologists. To further distinguish the three states from other historical Chinese states of similar names, historians have added a relevant character: Wei is also known as Cao Wei (曹魏), Shu is also known as Shu Han (蜀漢), and Wu is also known as Dong (or Eastern) Wu (東吳).

After Cao Cao reunified the north in 208, his son proclaimed the Wei dynasty in 220. Soon, Wei’s rivals Shu and Wu proclaimed their independence, leading China into the Three Kingdoms period. This period was characterized by a gradual decentralization of the state that had existed during the Qin and Han dynasties, and an increase in the power of great families.

Academically, the period of the Three Kingdoms refers to the period between the foundation of the state of Wei in 220 AD and the conquest of the state of Wu by the Jin dynasty in 280. The earlier, “unofficial” part of the period, from 184 to 220, was marked by chaotic infighting between warlords in various parts of China. The middle part of the period, from 220 and 263, was marked by a more militarily stable arrangement between three rival states of Wei, Shu, and Wu. The later part of the era was marked by the conquest of Shu by Wei (263), the overthrow of Wei by the Jin dynasty (265), and the conquest of Wu by the Jin (280).

The Three Kingdoms period is one of the bloodiest in Chinese history, and considered the third deadliest period of warfare in history behind World War II and the Taiping Rebellion. A nationwide census taken in AD 280, following the reunification of the Three Kingdoms under the Jin shows a total of 2,459,840 households and 16,163,863 individuals which was only a fraction of the 10,677,960 households, and 56,486,856 individuals reported during the Han era. While the census may not have been particularly accurate due to a multitude of factors of the times, the Jin in AD 280 did make an attempt to account for all individuals where they could.

Technology advanced significantly during this period. Shu chancellor Zhuge Liang invented the wooden ox, suggested to be an early form of the wheelbarrow, and improved on the repeating crossbow. Wei mechanical engineer Ma Jun is considered by many to be the equal of his predecessor Zhang Heng. He invented a hydraulic-powered, mechanical puppet theatre designed for Emperor Ming of Wei, square-pallet chain pumps for irrigation of gardens in Luoyang, and the ingenious design of the south-pointing chariot, a non-magnetic directional compass operated by differential gears.

Although relatively short, this historical period has been greatly romanticized in the cultures of China, Japan, Korea, and Vietnam. It has been celebrated and popularized in operas, folk stories, novels and in more recent times, films, television, and video games. The best known of these is Luo Guanzhong’s Romance of the Three Kingdoms, a Ming dynasty historical novel based on events in the Three Kingdoms period. The authoritative historical record of the era is Chen Shou’s Records of the Three Kingdoms, along with Pei Songzhi’s later annotations of the text.

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