Elizabeth Alexandra Mary was born at 02:40 (GMT) on 21 April 1926, during the reign of her paternal grandfather, King George V. Her father, Prince Albert, Duke of York (later King George VI), was the second son of the King. George VI was King of the United Kingdom and the Dominions of the British Commonwealth from 11 December 1936 until his death. He was the last Emperor of India and the first Head of the Commonwealth.
After suffering from lung cancer for several years, King George VI died in his sleep on February 6, 1952 at age 56. Upon his death, his oldest daughter, Princess Elizabeth, became queen. Elizabeth was 25 years old.
Elizabeth II has been Queen of the United Kingdom, Canada, Australia, and New Zealand since 6 February 1952. She is also Head of the Commonwealth and the queen of 12 countries that have become independent since her accession: Jamaica, Barbados, the Bahamas, Grenada, Papua New Guinea, Solomon Islands, Tuvalu, Saint Lucia, Saint Vincent and the Grenadines, Belize, Antigua and Barbuda, and Saint Kitts and Nevis.