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Re: British grant of ‘Royal Highness’
User logged in as Charles
Ok, it's from Wikipedia :
On 22 July 1885, the Queen made Prince Henry a Knight of the Garter, and granted him the style Royal Highness to give him equal rank with his wife. This style took effect in the United Kingdom, but not in the German Empire (where the Prince was still considered a Serene Highness) .
It references a passage in a single book but I would be interested in if there is a primary source to back it up. I don’t think that there is one, I cannot see why a style would be limited to the borders of the United Kingdom.