King of Wu
Following Cao Cao's death in March 220, his son and successor Cao Pi usurped the throne from Emperor Xian later that year, ended the Eastern Han dynasty, and established the state of Wei with himself as the new emperor. In 221, Liu Bei declared himself emperor and founded the state of Shu to challenge Wei's legitimacy. In the same year, Sun Quan pledged allegiance to Cao Pi and agreed to become a vassal under Wei; in return, Cao Pi granted him the title "King of Wu".