Δούκας της Κορνουάλης: Διαφορά μεταξύ των αναθεωρήσεων

*[https://web.archive.org/web/20050924190804/http://www.institutes.ex.ac.uk/ics/bernard%20Celtic%20frontier%20or%20county%20boundary.pdf Celtic Frontier or County Boundary? Competing discourses of a late nineteenth century British border] link dead

*[http://www.legislation.gov.uk/aep/Edw3/11/0 The charter of 1337]