South of the border and elsewhere in the world, Prince Charles is known as the Duke of Cornwall or Prince of Wales, but as soon as he crosses the border into Scotland, he takes on the title of Duke of Rothesay.
So, what’s it all about?
The title is ancient (but not quite as old as the title Prince of Wales or Duke of Cornwall).
It was created in 1398 and originally held by James Stewart, who was the heir to Robert III, King of Scotland.
In more recent history, it is awarded to the heir-apparent (ie first in the line of succession to the throne) and unlike many titles, is not transferrable to any younger sibling should the heir-apparent die.
As a title for a British (as opposed to Scottish) monarch, it fell out of favour in the 17th century and it was only when that great supporter of all things Scottish, Queen Victoria, revived the title for her son (who became King Edward VII) that it assumed the prominence that it does today.
The Duke of Rothesay last visited the island in 2016