Mr MacMarthanne added: “Whether this happens, and who it might affect, only time will tell.”
According to Mr MacMarthanne Archie will automatically become a prince when Charles takes the throne, despite Meghan and Harry’s royal exit.
The expert said: “As things presently stand, and irrespective of his parents’ withdrawal from front line royal duties, Archie Harrison Mountbatten-Windsor, otherwise the Earl of Dumbarton, and upon the accession of his grandfather HRH Prince Archie of Sussex, unless the Queen determines otherwise in the meantime, is, by courtesy, an earl, and will become an HRH and Prince.”
While Letters Patent dictate the laws around who is classified as an HRH, royal parents still have a say, Mr MacMarthanne explained.