For the same reason, I suppose, that Archie uses the title of Prince Archie of Sussex rather than Earl of Dumbarton. A title of Prince (with the territorial designation of your father's main title) supersedes a subsidiary title held by your father in the peerage of the United KIngdom, which is used by a peer's eldest son only by courtesy anyway, rather than is his own right.Hello all. Just curious about this. If the Earl of Wessex son ,once Edward became Duke of Edinburgh, became Earl of Wessex why is it that Prince George did not become Duke of Cambridge. Thanks.
All things being equal, James should be known as Prince James of Edinburgh rather than Earl of Wessex. He doesn't use his princely title by his parents' choice (and, presumably, after he turns 18, by his own choice, as is the case now of his sister too).
Note also that, again, James is not the Earl of Wessex. His father is. But, under the Letters Patent of 1917, he would be a Prince of the United Kingdom in his own right.
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