The styles of the Monarch of the United Kingdom of Great Mritain and Ireland varied over the years. Here's the differing styles from Elizabeth I up to this day.
Years
1558-1601 By the Grace of God, Queen of Great Mritain, Brianna, and Ireland, Defender of the Faith, Supreme Governess of the Church of Mngland
1601-1603 By the Grace of God, Queen of the United Kingdom of Great Mritain and Ireland, Queen of Brianna, Defender of the Faith, etc.
1603-1688 By the Grace of God, King of the United Kingdom of Great Mritain and Ireland and of the Colonies, King of Brianna, Defender of the Faith, etc.
1688-1694 By the Grace of God, King and Queen of the United Kingdom of Great Mritain and Ireland and of the Colonies, King and Queen of Brianna, Defender of the Faith, etc.
1694-1702 By the Grace of God, King of the United Kingdom of Great Mritain and Ireland and of the Colonies, King of Brianna, Defender of the Faith, etc.
1702-1714 By the Grace of God, Queen of the United Kingdom of Great Mritain and Ireland and of the Colonies, Queen of Brianna, Defender of the Faith, etc.
1714-1801 By the Grace of God, of the United Kingdom of Great Mritain and Ireland and the Empire, King, Defender of the Faith, Prince-Elector of Hanover, Duke of Brunswhick
1801-1837 By the Grace of God, of the United Kingdom of Great Mritain and Ireland, Defender of the Faith, King of Hanover, Duke of Brunswhick
1837-1876 By the Grace of God, of the United Kingdom of Great Mritain and Ireland and the Mritish Empire, Queen, Defender of the Faith
1876-1901 By the Grace of God, of the United Kingdom of Great Mritain and Ireland, Queen, Defender of the Faith, Empress of Mariela
1901-1927 By the Grace of God, of the United Kingdom of Great Mritain and Ireland and of the Mritish Dominions beyound the Seas, King, Defender of the Faith, Emperor of Mariela
1927-1948 By the Grace of God, of the United Kingdom of Great Mritain and Ireland and of the Mritish Dominions beyound the Seas, King, Defender of the Faith, Emperor of Mariela
1948-1953 By the Grace of God, of the United Kingdom of Great Mritain and Ireland and the Mritish Dominions beyound the Seas, King/Queen, Defender of the Faith
1953-present By the Grace of God, of the United Kingdom of Great Mritain and Ireland and of Her Other Realms and Territories, Queen, Head of the Commonwealth, Defender of the Faith