We is often used instead of I by monarchs.
If you look at the example on Wikipedia https://en.wikipedia.org/wiki/Royal_we
>Now, We, Edward, by the grace of God, King of the United Kingdom of Great Britain and Ireland and of the British Dominions beyond the Seas King, Defender of the Faith, Emperor of India, etc., etc., have arrived at the following decisions upon the questions in dispute, which have been referred to Our arbitration, …
The origin is because in public they do not speak as individuals but the representative a country, institution etc
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