Scotland cannot have a prince. In 1603, King James VI of Scotland became James I of Great Britain in the Union of the Crowns. He was of the Stewart line; the English Tudor line to the throne had died out. Queen Elizabeth II's title is actually incorrect as there has never been a Queen Elizabeth I of Great Britain -- only Queen Elizabeth I of England. Therefore, our current Queen should be called Queen Elizabeth I of Great Britain. She also holds the tile Queen of England and Queen of Scots.