Category
page 1States and territories established in the 520s

Kingdom of Mercia
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.

Turkic Khaganate
khaganate established by the Ashina clan of the Göktürks in medieval Inner Asia
Kingdom of Essex
former kingdom on the island of Britain (527–825 CE)
Theodorias
Byzantine province (528–7th Century)