Shu Han in the context of "Emperor Gaozu of Han"

The Three Kingdoms of Cao Wei, Shu Han, and Eastern Wu dominated China from AD 220 to 280 following the end of the Han dynasty. This period was preceded by the Eastern Han dynasty and followed by the Western Jin dynasty. Academically, the periodisation begins with the establishment of Cao Wei in 220 and ends with the conquest of Wu by Jin in 280. The period immediately preceding the Three Kingdoms, from 184 to 220, was marked by chaotic infighting among warlords across China as Han authority collapsed. The period from 220 to 263 was marked by a comparatively stable arrangement between Cao Wei, Shu Han, and Eastern Wu. This stability broke down with the conquest of Shu by Wei in 263, followed by the usurpation of Cao Wei by Jin in 266 and ultimately the conquest of Wu by Jin in 280.

The Three Kingdoms period including the collapse of the Han was one of the most dangerous in Chinese history due to multiple plagues, widespread famines, and civil war. A nationwide census taken in 280, following the reunification of the Three Kingdoms under the Jin showed 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, in 280, the Jin did make an attempt to account for all individuals where they could.

Sichuan, previously romanized as Szechwan or Szechuan, is a province in Southwestern China, occupying the Sichuan Basin and Tibetan Plateau—between the Jinsha River to the west, the Daba Mountains to the north, and the Yunnan–Guizhou Plateau to the south. Its capital city is Chengdu, and its population stands at 83 million. Sichuan neighbors Qinghai and Gansu to the north, Shaanxi and Chongqing to the east, Guizhou and Yunnan to the south, and Tibet to the west.

During antiquity, Sichuan was home to the kingdoms of Ba and Shu until their incorporation by the Qin. During the Three Kingdoms era (220–280), Liu Bei's state of Shu was based in Sichuan. The area was devastated in the 17th century by Zhang Xianzhong's rebellion and the area's subsequent Manchu conquest. However, the area recovered to become one of China's most productive by the 19th century. During World War II, Chongqing served as the temporary capital of the Republic of China, and was heavily bombed. It was one of the last mainland areas captured by the People's Liberation Army during the Chinese Civil War, and was divided into four parts from 1949 to 1952, with Chongqing restored two years later. It suffered gravely during the Great Chinese Famine (1959–1961) but remained China's most-populous province until Chongqing was again separated from it in 1997.

The end of the (Eastern) Han dynasty was the period of Chinese history from 189 to 220 CE, roughly coinciding with the tumultuous reign of the Han dynasty's last ruler, Emperor Xian. It was followed by the Three Kingdoms era (220–280 CE). During the end of the Han dynasty, 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. The warlord Cao Cao took control of Emperor Xian and his court in 196 and began gradually reunifying the empire. Cao Cao ostensibly operated under Emperor Xian's rule, though in reality the emperor was a hostage.

Cao Cao's efforts to reunify China 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 dynasty, Cao Wei. In response, Liu Bei established the Shu Han dynasty in 221 with himself as its emperor. Sun Quan founded the Eastern Wu dynasty in 222, first adopting the title of king and later declared himself emperor in 229. The period from the end of the Han dynasty in 220 to the reunification of China proper under the Western Jin dynasty in May 280 is known as the Three Kingdoms era in Chinese history.

The Conquest of Shu by Wei was a military campaign launched by the dynastic state of Cao Wei against its rival Shu Han in late 263 during the Three Kingdoms period of China. The campaign culminated in the fall of Shu Han and the tripartite equilibrium maintained in China for over 40 years since the end of the Eastern Han dynasty in 220. The conquest laid the foundation for an eventual reunified China under the Western Jin dynasty in 280.

Cao Pi (pronunciation) (c.late 187 – 29 June 226), courtesy name Zihuan, was the first emperor of the state of Cao Wei in the Three Kingdoms period of China. He was the second son of Cao Cao, a warlord who lived in the late Eastern Han dynasty, but the eldest son among all the children born to Cao Cao by his concubine (later wife), Lady Bian. According to some historical records, he was often in the presence of court officials in order to gain their support. He was mostly in charge of defence at the start of his career. After the defeat of Cao Cao's rival Yuan Shao at the Battle of Guandu, he took Yuan Xi's wife, Lady Zhen, as a concubine, but in 221 Lady Zhen died and Guo Nüwang became empress.

On 25 November 220, Cao Pi forced Emperor Xian, the last ruler of the Eastern Han dynasty, to abdicate in his favour, after which on 11 December 220 he proclaimed himself emperor and established the state of Cao Wei. Cao Pi continued the wars against the states of Shu Han and Eastern Wu, founded by his father's rivals Liu Bei and Sun Quan, respectively, but did not make significant territorial gain in the battles. Unlike his father, Cao Pi concentrated most of his efforts on internal administration rather than on waging wars against his rivals. During his reign, he formally established Chen Qun's nine-rank system as the base for civil service nomination, which drew many talents into his government. On the other hand, he drastically reduced the power of princes, stripping off their power to oppose him, but at the same time, rendering them unable to assist the emperor if a crisis arose within the state. After Cao Pi's death, his successor Cao Rui granted him the posthumous name "Emperor Wen" and the temple name "Gaozu".

Taoism is an East Asian religion founded in ancient China with many schools or denominations, of which none occupies a position of orthodoxy and co-existed peacefully. Taoist branches usually build their identity around a set of scriptures, that are manuals of ritual practices. Scriptures are considered "breathwork", that is "configurations of energy" (qi), embodiments of "celestial patterns" (tianwen), or "revelations of structures" (li).

The earliest Taoist schools emerged during the late Eastern Han dynasty (25–220 CE). They blossomed especially in the region of Shu, modern-day Sichuan. From the 12th and 13th centuries onwards several smaller branches merged into larger ones, but in turn, side-schools developed around the large traditions. In modern times the existing schools tend to be classified under few overarching headings, in most cases under two main denominations: Quanzhen Taoism and Zhengyi Taoism.

Romance of the Three Kingdoms (traditional Chinese: 三國演義; simplified Chinese: 三国演义; pinyin: Sānguó Yǎnyì) is a 14th-century historical novel attributed to Luo Guanzhong. It is set in the turbulent years towards the end of the Han dynasty and the Three Kingdoms period in Chinese history, starting in 184 CE and ending with the reunification of the land in 280 by the Western Jin. The novel is based primarily on the Records of the Three Kingdoms, written by Chen Shou in the 3rd century.

The story–part historical and part fictional–romanticises and dramatises the lives of lords and their retainers, who tried to supplant the dwindling Han dynasty or restore it. While the novel follows hundreds of characters, the focus is mainly on the three power blocs that emerged from the remnants of the Han dynasty, and would eventually form the three states of Cao Wei, Shu Han, and Eastern Wu. The novel deals with the plots, personal and military battles, intrigues, and struggles of these states to achieve dominance for almost 100 years.

Zhuge Liang (pronunciation) (181 AD – September or October 234 AD), also commonly known by his courtesy name Kongming, was a Chinese statesman, strategist and inventor who lived through the end of the Eastern Han dynasty (c. 184–220) and the early Three Kingdoms period (220–280). During the Three Kingdoms period he served as Imperial Chancellor (or Prime Minister) of the state of Shu Han (221–263) from its founding in 221 and later as regent from 223 until his death.

Zhuge is recognised as the most accomplished strategist of his era. His reputation as an intelligent and cultured scholar grew even while he was living in relative seclusion, earning him the nickname "Wolong" or "Fulong" (both meaning "Sleeping Dragon").

Liu Bei (Chinese: 劉備, pronunciation; Mandarin pronunciation: [ljǒʊ pêɪ]; 161 – 10 June 223), courtesy name Xuande (玄德), was a Chinese warlord in the late Eastern Han dynasty who later became the founding emperor of Shu Han, one of the Three Kingdoms of China.

Despite early failings and lacking both the material resources and social status other warlords of his time commanded, he gathered support among Han loyalists who opposed Cao Cao, the warlord who controlled the Han central government and the figurehead Emperor Xian, and led a popular movement to restore the Han dynasty. Liu Bei overcame a number of setbacks to carve out his own realm, which at its peak spanned present-day Sichuan, Chongqing, Guizhou, Hunan, and parts of Hubei, Yunnan, and Gansu.