The title Marquess of Dorset has been created three times in the Peerage of England, it was then created in which year, for Edmund Beaufort, 1st Earl of Dorset?
Edmund Beaufort, 2nd Duke of Somerset: Edmund Beaufort, 2nd Duke of Somerset, KG (1406 – 22 May 1455), sometimes styled 1st Duke of Somerset, was an English nobleman and an important figure in the Wars of the Roses and in the Hundred Years' War.
i don't know