Yi Province or Yizhou (益州), was a province of ancient China. Its capital city was Chengdu, and the province also included the commanderies of Hanzhong, Wudu, Yuexi and Yi. It was bordered in the north by Liang Province. Yi covered present-day Sichuan and Chongqing.
In 213, warlord Cao Cao conquered the city of Hanzhong from the Taoist cult leader Zhang Lu, and threatened the rest of Yi. Liu Zhang requested the help of warlord Liu Bei, a relative of his, but the latter turned against Zhang, conquered most of Yi Province, and proclaimed the Kingdom of Shu. During the subsequent Hanzhong Campaign (217–219), Liu Bei was able to conquer Hanzhong from Cao Cao and thus complete his control over Yi Province. In 221, Liu Bei assumed the title of emperor.
- de Crespigny, p. 256.
- de Crespigny, p. 10–11.
- de Crespigny, Rafe (2016). Fire over Luoyang: A History of the Later Han Dynasty 23-220 AD. Leiden: Brill. p. 432. ISBN 9789004325203. Retrieved 28 April 2018.
- de Crespigny, p. 472.