These are the most senior in rank among English Peerage. From the Latin meaning “Leader”, it was first coined for Edward “The Black Prince” when was made Duke of Cornwall in 1337. An earlier “debated” use has been attributed to William The Conqueror in 1067 as “Ducis”. The first “non-Royal” Dukedom was granted in 1351. This title is now a “Generational” identifier for Noblemen (and their descendants).