HRH Princess Elizabeth and the Duke of Edinburgh at the Earl of Harewood's wedding. Elizabeth II (Elizabeth Alexandra Mary; born 21 April 1926) is Queen of the United Kingdom and 15 other Commonwealth realms. Prince Philip, Duke of Edinburgh (born Prince Philip of Greece and Denmark, later Philip Mountbatten; 10 June 1921 - 9 April 2021), was a member of the British royal family as the husband of Queen Elizabeth II. He was the consort of the British monarch from Elizabeth's accession on 6 February 1952 until his death in 2021, making him the longest-serving royal consort in history.