Sub-Roman Britain is the name given to Britain from the withdrawal of the Roman legions in 410 AD to the beginning of the seventh century.
After four centuries of rule, Roman legions withdrew from Roman Britain at the beginning of the fifth century. However Roman culture and probably a vernacular Latin language survived for another two centuries with a gradual invasion by the Anglo-Saxons from northern Germany and the Jutland peninsula.
The invasion was initially halted by the Romano-British. The Anglo-Saxons obtained control of eastern England at the end of the 5th century. In the mid-6th century they started expanding again into the English Midlands. Then in the 7th century they expanded again into the south-west and the north of England. The unconquered parts of southern Britain, notably Wales and surrounding areas of western Britain, retained their Romano-British culture, in particular Christianity.
Some Anglo-Saxon histories (in context) refer to the Romano-British people by the term "Welsh", which is an Old English word meaning 'foreigner', referring to the old inhabitants of southern Britain. Historically, Wales and the south-western peninsula were known respectively as North Wales and West Wales.
One of the last Sub-Roman cities to be conquered by the Anglo-Saxons was Deva Victrix (Chester), where Roman "amphoras" were used until 616 AD. The Romano-British may have survived partly because of the Chester city walls; the city had been defended by walls since the foundation of the Deva Victrix fort on the site in 79 AD.
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