Fei Yi, courtesy name Wenwei, was a Chinese diplomat, military general, politician, and regent of the state of Shu during the Three Kingdoms period of China. Born in the late Eastern Han dynasty, Fei Yi started his career as an attendant to Liu Shan, the eldest son and heir apparent of Liu Bei, a warlord who became the founding emperor of Shu. After Liu Shan became emperor in 223, Fei Yi gradually rose to prominence under the regency of Zhuge Liang, the Imperial Chancellor of Shu. During this time, he concurrently served as a military adviser under Zhuge Liang and as Shu's ambassador to its ally state Wu. He also played a significant role in the conflict between the Shu general Wei Yan and Zhuge Liang's chief clerk Yang Yi. After Zhuge Liang's death in 234, Fei Yi served as a deputy to the new regent Jiang Wan and progressively assumed greater responsibilities as Jiang Wan gradually relinquished his powers due to poor health. In 244, Fei Yi led Shu forces to victory at the Battle of Xingshi against their rival state Wei and succeeded Jiang Wan as regent of Shu two years later following the latter's death. On the first day of the Chinese New Year in 253, Fei Yi was assassinated by a Wei defector, Guo Xiu.

Han (漢; 221–263), known in historiography as Shu Han (蜀漢 ) or Ji Han (季漢 "Junior Han"), or often shortened to Shu (Chinese: 蜀; pinyin: Shǔ; Sichuanese Pinyin: Su2 < Middle Chinese: *źjowk < Eastern Han Chinese: *dźok), was a dynastic state of China and one of the three major states that competed for supremacy over China in the Three Kingdoms period. The state was based in the area around present-day Hanzhong, Sichuan, Chongqing, Yunnan, Guizhou, and north Guangxi, an area historically referred to as "Shu" based on the name of the past ancient kingdom of Shu, which also occupied this approximate geographical area. Its core territory also coincided with Liu Bang's Kingdom of Han, the precursor of the Han dynasty.