Elizabeth II (Elizabeth Alexandra Mary; born 21 April 1926 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.[b]
Elizabeth was born in London as the first child of the Duke and Duchess of York, later King George VI and Queen Elizabeth. She was educated privately at home. Her father acceded to the throne on the abdication of his brother Edward VIII in 1936, from which time she was the heir presumptive. She began to undertake public duties during the Second World War, serving in the Auxiliary Territorial Service. In 1947, she married Philip, Duke of Edinburgh, a former prince of Greece and Denmark, with whom she has four children: Charles, Prince of Wales; Anne, Princess Royal; Prince Andrew, Duke of York; and Prince Edward, Earl of Wessex.
Elizabeth's many historic visits and meetings include a state visit to the Republic of Ireland and visits to or from five popes. She has seen major constitutional changes, such as devolution in the United Kingdom, Canadian patriation, and the decolonisation of Africa. She has also reigned through various wars and conflicts involving many of her realms. She is the world's oldest reigning monarch as well as Britain's longest-lived. In 2015, she surpassed the reign of her great-great-grandmother, Queen Victoria, to become the longest-reigning British monarch and the longest-reigning queen regnant and female head of state in world history. In October 2016, she became the longest currently reigning monarch and head of state following the death of King Bhumibol Adulyadej of Thailand.