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Noble forms of address were meant to be international. Royals married other royals, so majesty was not just for one House or nation. There is some variation though, as the Prince of Monaco is Ser...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/39855 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/