Royal Style and Titles Act

Following the enactment of the Statute of Westminster 1931, the governments of the now separate and independent realms sharing one person as sovereign agreed in 1949 that each should adopt its own royal style and title, which was done in 1952.

By 1926, following the issuance of the Balfour Declaration, it was determined that the changes in the nature of the Empire needed to be reflected in King George V's title.

The preamble to the Statute of Westminster 1931 established the convention requiring the consent of all the Dominions' parliaments, as well as that of the United Kingdom, to any alterations to the monarch's style and title.

The parliament of each then-realm of the Commonwealth passed its own Royal Style and Titles Act before Elizabeth's coronation in June of the following year.

After the Governor-General's proclamation dated 11 February 1982, the sovereign's official title was Elizabeth the Second, by the Grace of God, Queen of Antigua and Barbuda and of Her other Realms and Territories, Head of the Commonwealth.

[8] In April 2023, after the accession of Charles III to the Canadian throne, the Deputy Prime Minister, on behalf of Cabinet, introduced Bill C-47 in the House of Commons.

[11] The new title is, in English, Charles the Third, by the Grace of God King of Canada and His other Realms and Territories, Head of the Commonwealth and, in French, Charles Trois, par la grâce de Dieu, Roi du Canada et de ses autres royaumes et territoires, Chef du Commonwealth.

The title created from this act was Elizabeth II, by the Grace of God of the United Kingdom, New Zealand and Her Other Realms and Territories Queen, Head of the Commonwealth, Defender of the Faith.

The title was equivalently, and, for the first time, set in Latin, as Elizabeth II, Dei Gratia Britanniarum Regnorumque Suorum Ceterorum Regina, Consortionis Populorum Princeps, Fidei Defensor.