States and territories disestablished in the 910s

Mercia () was an early medieval English kingdom, one of the seven kingdoms of the Anglo-Saxon period. It was centred on the River Trent and its tributaries, in a region now known as the Midlands of England.

Anglo-Saxon kingdom in southeast Britain

Alamannia, or Alemania, was the kingdom established and inhabited by the Alemanni, a Germanic tribal confederation that had broken through the Roman limes in 213.

'''T'aebong''' () was a state established by Kung Ye on the Korean Peninsula in 901 during the Later Three Kingdoms period.

short-lived dynasty near present-day Beijing