Cornwall Cornwall Cornwall (; ) is a county in South West England in the United Kingdom. The county is bordered to the north and west by the Celtic Sea, to the south by the English Channel, and to the east by the county of Devon, over the River Tamar which forms most of the border between them. Cornwall forms the westernmost part of the South West Peninsula of the island of Great Britain. The furthest southwestern point of the island is Land's End; the southernmost point is Lizard Point. Cornwall has a population of and covers an area of . The
Duke of Cornwall Anglo-Saxon settlement of Britain, Cornwall formed part of the separate Kingdom of Dumnonia, which included Devon, although there is evidence that it may have had its own rulers at times. The southwest of Britain was gradually incorporated into the emerging Kingdom of England, and after the Norman Conquest in 1066 the new rulers of England appointed their own men as Earl of Cornwall, the first of whom was in fact a Breton of 'Cornwall' in Brittany. Edward, the Black Prince, the eldest son of Edward III, was made the first Duke of Cornwall in 1337, after Edward III had lost