公安县
On 25 November 220, Emperor Xian, the figurehead monarch of the Eastern Han dynasty, abdicated in favour of Cao Pi and ended the Eastern Han dynasty. On 11 December, Cao Pi established the state of Wei to replace the Eastern Han dynasty and became its first emperor. On 10 May 221, Liu Bei declared himself emperor and established a new state, historically known as Shu, to contest Cao Pi's claim to the Han throne. Around the same time, Sun Quan shifted the capital of his territories from Gong'an County to E County, which he renamed "Wuchang" (). On 23 September 221, Sun Quan pledged allegiance to Cao Pi and became a vassal of the Wei state; in return, Cao Pi awarded Sun Quan the title "King of Wu" ().