Her Majesty Queen Elizabeth II (Elizabeth Alexandra Mary Windsor), styled HM The Queen ( born 21 April 1926) is the queen regnant and head of state of Antigua and Barbuda, Australia, the Bahamas, Barbados, Belize, Canada, Grenada, Jamaica, New Zealand, Papua New Guinea, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, the Solomon Islands, Tuvalu, and the United Kingdom of Great Britain and Northern Ireland.
She is also Head of the Commonwealth, Supreme Governor of the Church of England, Commander-in-Chief of the UK Armed Forces and Lord of Mann; she has reigned in these positions since the death of her father, King George VI on 6 February 1952. She is the longest serving current Head of State in Europe, Africa, The Americas, and Australasia, and is the second longest-serving current head of state in the world, after King Bhumibol Adulyadej of Thailand.
About 125 million people live in the countries of which she is Head of State. Her reign has seen ten different Prime Ministers of the United Kingdom and numerous Prime Ministers in the other personal union nations of which she is or was Head of State. She is married to Prince Philip, Duke of Edinburgh, and is the mother of the heir-apparent to the British throne, Charles, Prince of Wales.