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Cornwall was the home of a division of the Dumnonii tribe – whose tribal centre was in the modern county of Devon – known as the Cornovii, separated from the Brythons of Wales after the Battle of Deorham, often coming into conflict with the expanding kingdom of Wessex before King Athelstan in AD 936 set the boundary between English and Cornish at the high water mark of the eastern bank of the River Tamar.