In July 1917 King George V issued a proclamation renouncing all German titles and dignities…
A Royal Heraldry - A ROYAL HERALDRY
British royal family change their name to Windsor - archive 1917
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The Royal Archives
List of titles and honours of George VI - Wikiwand
List of titles and honours of George VI - Wikipedia
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British royal family change their name to Windsor - archive 1917
Timeline, Downton Abbey Wiki
British royal family change their name to Windsor - archive 1917
royalty Archives - The National Archives blog
In the 1917 Proclamation changing the name of the British Royal Family, why did the King refer to himself, Empress Victoria, and other royals as “subjects of these realms”? - Quora