Duke of Strathearn
Appearance
The title Duke of Strathearn has never existed, but there have been three dukedoms with "Strathearn" in the title:
Strathearn is an area in Perthshire central Scotland. The river Earn which runs through the heart of the strath and is a tributary to the river Tay.
William, Prince of Wales, first-in-line to the throne of the United Kingdom, was created Duke of Cambridge and Earl of Strathearn on his wedding day.