Nobody seems to have thought of National Anthems before. There were drinking songs like "Here's a Health Unto His Majesty" or the French "Vive Henri IV" - Here's a version of that I rather like

But theidea of official National Anthems seems to have been a 20th century invention.
I've thought it poignant that the opposite sides in the Great War both used the God Save the King tune for patriotic purposes.
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"God save the Quing" - I like that. Of course you could have the meritocratic version instead "God Save the Keen".