Quote Originally Posted by kilt by death
Quote Originally Posted by Doc Hudson
I am afraid that the Monarchy will fall if, or before Charles III ascends the throne.
Technically, he would be Charles I, of Britain. Charles I and II were kings of England!!
Using that logic, Prince Charles' mother would be not Elizabeth II but Elizabeth I, since that other Elizabeth was Queen of England and Wales only. And his great Uncle should have been Edward II rather than Edward VII.

If Prince Charles ascends the throne, and uses the name Charles rather than one of his other names, I'm reasonably sure that he will be Charles III.

BTW, as the son and grandson of James VII of Scotland, aka James I of England, Charles I and II were also Kings of Scotland. And I believe both were officially crowned as such.