In July 1917 King George V issued a proclamation renouncing all German titles and dignities…
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
What is the Queen's last name and why does the Royal Family not use their surnames? - Quora
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
Wettin to Windsor: changing the royal name - The National Archives blog
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House of Wettin - Wikipedia
The British Royal House - Wettin - Windsor Dynasty
NPG x198439; (Henri) Philippe Benoni Omer Joseph Pétain and King George V at the front - Portrait - National Portrait Gallery
How German is the Queen?