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Old 02-12-2020, 10:44 AM
gnoitall is offline
Join Date: Jul 2009
Posts: 6,116
Originally Posted by dtilque View Post
The number is not part of the name, so they don't get to choose it.
They most assuredly do:
A court case, MacCormick v Lord Advocate, contesting the style "Elizabeth II" within Scotland, was decided in 1953 on the grounds that the numbering of monarchs was part of the royal prerogative, and that the plaintiffs had no title to sue the Crown.
Emphasis added

This case settled the issue of whether Elizabeth was II in Scotland, even though Elizabeth I wasn't Queen of Scotland in her time. Charles can pick regnal number "pi" if he's so inclined, and no one has any standing to contest it. "Royal prerogative."