Elizabeth II (Elizabeth Alexandra Mary; 21 April 1926 – 8 September 2022) was Queen of the United Kingdom and other Commonwealth realms from 6 February 1952 until her death in 2022. She was queen regnant of 32 sovereign states during her lifetime and was the monarch of 15 realms at her death. Her reign of 70 years and 214 days is the longest of any British monarch, the second-longest of any sovereign state, and the longest of any queen regnant in history. Elizabeth was born in Mayfair, London, during the reign of her paternal grandfather, King George V. She was the first child of the Duke and Duchess of York (later King George VI and Queen Elizabeth the Queen Mother). Her father acceded to the throne in 1936 upon the abdication of his brother Edward VIII, making the ten-year-old Princess Elizabeth the heir presumptive. She was educated privately at home and began to undertake public duties during the Second World War, serving in the Auxiliary Territorial Service. In November 1947, she married a former prince of Greece and Denmark, Philip Mountbatten. They had four children: Charles, Anne, Andrew, and Edward. When her father died in February 1952, Elizabeth, then 25 years old, became queen of seven independent Commonwealth countries and head of the Commonwealth. She reigned as a constitutional monarch through times of significant political change such as the Troubles in Northern Ireland, devolution in the United Kingdom, the decolonisation of Africa, and the United Kingdom's accession to the European Communities as well as its subsequent withdrawal. The number of her realms varied over time as territories gained independence and as most realms became republics. As queen, Elizabeth was advised by more than 170 prime ministers across her realms. Her many historic visits and meetings included state visits to China in 1986, to Russia in 1994, and to the Republic of Ireland in 2011; she met five popes and fourteen US presidents. Significant events of Elizabeth's reign included her coronation in 1953 and the celebrations of her Silver, Golden, Diamond, and Platinum jubilees. Although there was occasional republican sentiment and media criticism of her family – particularly after the breakdowns of her children's marriages, her annus horribilis in 1992, and the death of her former daughter-in-law Diana in 1997 – support for the monarchy and her popularity in the United Kingdom remained consistently high. Elizabeth died aged 96 at Balmoral Castle in Scotland, and was succeeded by her eldest son, Charles III.