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After the Roman withdrawal, Cornwall became part of the kingdom of Dumnonia, which also included Devon (the name derived from Dumnonia). Its geographical position enabled it to survive for centuries. Dumnonia was sufficiently part of the known world for Aldhelm, bishop of Sherborne, to address a letter, c.705, to its king Geraint, putting him right on the date of Easter, and though Geraint was defeated by Ine of Wessex c.710, the kingdom survived. Egbert of Wessex completed the conquest of the area in 814.

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