Elizabeth II (Elizabeth Alexandra Mary; born 21 April 1926) is the constitutional monarch of 16 sovereign states, known as the Commonwealth realms, and their territories and dependencies, and head of the 53-member Commonwealth of Nations. She is Supreme Governor of the Church of England and, in some of her realms, carries the additional title of Defender of the Faith.Upon her accession on 6 February 1952, Elizabeth became Head of the Commonwealth and queen regnant of seven independent Commonwealth countries: the United Kingdom, Canada, Australia, New Zealand, South Africa, Pakistan and Ceylon. From 1956 to 1992, the number of her realms varied as territories gained independence and some realms became republics. At present, in addition to the first four of the aforementioned countries, Elizabeth is Queen of Jamaica, Barbados, the Bahamas, Grenada, Papua New Guinea, the Solomon Islands, Tuvalu, Saint Lucia, Saint Vincent and the Grenadines, Belize, Antigua and Barbuda, and Saint Kitts and Nevis. She is currently the longest lived and second longest reigning British monarch; only Queen Victoria, her great-great grandmother, reigned longer.Elizabeth was born in London and educated privately at home. Her father acceded to the throne as George VI in 1936 on the abdication of his brother Edward VIII, from which time she was the heir presumptive. She began to undertake public duties during the Second World War, in which she served in the Auxiliary Territorial Service. In 1947, she married Prince Philip of Greece and Denmark, with whom she has four children: Charles, Anne, Andrew, and Edward. Her coronation service took place in 1953 and was the first to be televised.Elizabeth II's many historic visits and meetings include a state visit to the Republic of Ireland, the first state visit of an Irish president to Britain, and reciprocal visits to and from the Pope. Elizabeth has seen major constitutional changes in her realms, such as devolution in the United Kingdom and the patriation of the Canadian constitution. She has also reigned through various wars and conflicts involving many of her realms.Times of personal significance have included the births and marriages of her children and grandchildren, the investiture of the Prince of Wales, and the celebration of milestones such as her Silver, Golden, and Diamond Jubilees in 1977, 2002, and 2012, respectively. Moments of sorrow for her include the death of her father at 56, the assassination of Prince Philip's uncle, Lord Mountbatten, the breakdown of her children's marriages in 1992 (a year deemed her annus horribilis), the death in 1997 of her son's former wife, Diana, Princess of Wales, and the deaths of her mother and sister in 2002. Elizabeth has occasionally faced republican sentiments and severe press criticism of the royal family, but support for the monarchy and her personal popularity remain high.