Originally Posted by Kataryn
Agreed. But which king Charles will he be? I know that former kings are counted if they reigned in the same place, even if it was a different kingdom. Hence Elizabeth is Elisabeth II., though there never was an Elizabeth I. of Scotland. But as England is a part of the Uk, she is the second Elizabeth to rule there. Now with Charles we get a historical problem: does they follow the de jure or the de facto kings? For de facto Charles would be Charles III., as there were two kings Charles of the kingdoms of England, Scotland and Ireland.
De jure there was a Charles III. as well, as grandson of the deposed king James he was a nephew of queen Anne and thus close to the throne: Charles Edward Stuart, aka Bonnie Prince Charlie. When he tried to take back his inheritance 1745, he took Edinburgh and was named there as Princeregent for his father James III. who had stayed in Rome. After his uprising failed, the Princeregent (officially named that by his father before 1745) settled back in Rome and in 1766, after his father's death, declared himself Charles III. A title the pope acknowledged.
Now of course the British Parliament didn't acknowledge him, so Chalres could take the Regal Number, but still, it makes me wonder if Charles wants to take that or if he will give "Bonnie Prince Charlie" this acknowledgement (he was the last male-line Stuart anyway) and reign as Charles IV. or go with the title of George VII?
In times when the Scottish independence is still a very actual topic, there might be discussions about that as well.
If he recognized Bonnie Prince Charlie, he would have by analogy to recognize also all subsequent de jure
kings of England and Scotland in the Jacobite line of succession (respectively of the Houses of Orléans, Savoy, Austria-Este, and Wittelsbach). And he would also have to acknowledge that all British monarchs from William III and Mary II to his mother were illegitimate.
Of course that is not going to happen. Parliament asserted its sovereignty in 1689 and again in 1701 declaring that it has the exclusive power to determine by law the order of succession to the throne. And the law excluded all Jacobite pretenders including Bonnie Prince Charlie from the succession.