Well, your thoughts have been thorough and well thought out and I was ready to accept the fact that options for Royal Ducal Titles were running thin. Then I saw this news below which appears to indicate that it is possible for the monarch to create a Dukedom from a title already extant by an Earldom? I would like to get your thoughts.
And little more than a week after the world had celebrated another royal marriage between the new Duke and Duchess of Cambridge in London, there was a new Countess of Cambridge in Miss Rutherford - taking the title from her husband, who is also the Earl of Cambridge.
Wedding of 16th Duke of Hamilton / News / Roundup / Articles / East Lothian Courier Please also see:
Alexander Douglas-Hamilton, 16th Duke of Hamilton - Wikipedia, the free encyclopedia
The title held by the Duke of Hamilton and Brandon is actually
Earl of Arran and Cambridge, which is in the peerage of Scotland and is not related to the English earldom. Traditionally this title has simply been used as
Earl of Arran..
I do not believe that a royal ducal title would be considered using the same name as an extant peerage in England, Scotland, Great Britain or the United Kingdom.
These two Cambridge titles are not the same, especially since the Scots title is a double-named earldom. It is not proper to use "Cambridge" without using Arran before it, and has mostly been dropped altogether in historical usage.
The Duke's wife will never be known as a "Countess" anyway. She is the
Duchess of Hamilton and Brandon. Even if her "Cambridge" title were
ever used, it would have to be as
Countess of Arran and Cambridge, but most likely would simply be given as
Countess of Arran.
There is also no precedent for the use of this title, even as a courtesy. The Duke's heir apparent is styled Marquess of Douglas and Clydesdale, and the eldest son of the heir apparent is styled Earl of Angus (although neither title is currently in use, since the Duke just recently married). Even if there were a third direct heir to the dukedom, the courtesy title would be Lord Abernethy and Jedburgh Forest, which is the third senior title available for use.
The title to "Cambridge" in
Scotland, is a hold-over from the 4th creation of the earldom of Cambridge in the peerage of
England, which was given to James Hamilton, 2nd Marquess of Hamilton in 1619. This English title became extinct in 1651 with the death of his son William, 2nd Duke of Hamilton, who had no surviving sons.
William had been created
Earl of Arran and Cambridge in the peerage of Scotland in 1643, and this earldom was inherited by his niece Anne, 3rd Duchess of Hamilton. Definitely not the same title as the English earldom, which can only be inherited in the male line.
The Scots title has been a subsidiary of the Dukes of Hamilton ever since, however, the last (7th) creation of the English earldom of Cambridge became extinct in 1671. All of the
Dukes of Cambridge have been male members of the royal family, with the latest and 5th creation being given to Prince William of Wales. But there has never been an
extant Earl and
extant Duke of Cambridge at the same time.