(CNN)Here's a look at the life of Elizabeth II, Queen of the United Kingdom of Great Britain and Northern Ireland, and of her other Realms and Territories and Head of the Commonwealth of Nations.
Birth date: April 21, 1926
Birthplace: London, England
Birth name: Elizabeth Alexandra Mary
Father: King George VI
Mother: Queen Elizabeth
Children: Prince Edward, Earl of Wessex (March 10, 1964); Prince Andrew, Duke of York (February 19, 1960); Anne, Princess Royal (August 15, 1950); Charles, Prince of Wales (November 14, 1948)
Grandchildren: By Prince Charles and Princess Diana: Prince William and Prince Henry (called Harry); By Princess Anne and Mark Phillips: Peter Phillips and Zara Phillips; By Prince Andrew and Sarah Ferguson: Princess Beatrice and Princess Eugenie; By Prince Edward and Sophie Rhys-Jones: Lady Louise Windsor and James Windsor, Viscount Severn
Great-Grandchildren: By Zara Phillips Tindall: Mia; By Prince William: George Alexander Louis and Charlotte Elizabeth Diana; By Peter Phillips: Savannah and Isla
She is named after her mother Queen Elizabeth, her paternal great-grandmother Queen Alexandra and her paternal grandmother Queen Mary.
She was not declared the Heir Apparent when her uncle, King Edward VIII, abdicated because of the possibility of a male heir.
When World War II began she was a Girl Guide (British Girl Scouts) and went through the same training as the other Girl Guides her age.
Official title after March 26, 1953: Elizabeth II, By the Grace of God, of the United Kingdom of Great Britain and Northern Ireland, and of her other Realms and Territories, Queen, Head of the Commonwealth, Defender of the Faith
She is the sixth female to ascend to the British throne and at 62 years and counting hers is second longest reign of a British monarch, after Queen Victoria (1837-1901) 63 years, seven months.
May 29, 1926 - Princess Elizabeth Alexandra Mary, third in line to the throne is christened. She is the first royal child to be christened in the chapel at Buckingham Palace and wears a gown made of lace worn by Queen Elizabeth I.
December 11, 1936 - Elizabeth becomes heir presumptive when her father becomes King George VI, after the abdication of his brother King Edward VIII.
May 12, 1937 - Elizabeth attends the coronation of her parents, King George VI and Queen Consort Elizabeth. She is the first female heir presumptive to see her parents crowned.
1939 - World War II breaks out. Elizabeth moves, with her sister, to the Royal Lodge at Windsor Castle. Thought to be the time period when Elizabeth meets Prince Philip of Greece.
1942 - King George VI makes Elizabeth an honorary colonel in the 500 Grenadier Guards, a regiment of the Royal Army.
April 21, 1942 - Elizabeth makes her official public debut with a review of the 500 Grenadier Guards at Windsor Palace.
1944 - Elizabeth is made a member of the Privy Council and the Council of State. She is now able to act for the king during his absence from the country.
July 10, 1947 - King George VI and Queen Elizabeth announce Elizabeth's engagement to Prince Philip of Greece, a lieutenant in the British Navy.
November 20, 1947 - Princess Elizabeth marries Philip. After becoming a British citizen and renouncing his Greek title, Philip becomes His Royal Highness Prince Philip, Duke of Edinburgh. Elizabeth becomes the Duchess of Edinburgh.
February 6, 1952 - King George VI dies of lung cancer, and Elizabeth ascends to the throne.
April 11, 1952 - The Queen decrees that she and her descendents will continue to use the surname Windsor, first adopted by the British royal family during World War I.
June 2, 1953 - Coronation takes place at Westminster Abbey.
October 16-22, 1957 - Queen Elizabeth II and Prince Philip make their first state visit to the United States and she addresses the General Assembly of the United Nations
May 14, 1965 - Queen Elizabeth II dedicates a memorial and one acre of land at Runnymede to the United States as a memorial to President John F. Kennedy.
June 13, 1981 - A teenager, Marcus Simon Sarjeant, fires six blanks at the Queen while she is riding on horseback through London. He is arrested and charged with treason.
July 9, 1982 - A man penetrates security at Buckingham Palace and encounters the Queen in her bedroom.
May 16, 1991 - The Queen addresses a joint session of the United States Congress, the first British monarch to do so.
November 24, 1992 - At a luncheon commemorating her 40th anniversary on the throne, the Queen declares 1992 as an "Annus Horribilis". That year marked the separation of the Duke and Duchess of York, the divorce of Princess Anne and Mark Phillips, the increasing estrangement of the Prince and Princess of Wales, and the fire at Windsor Castle.
November 26, 1992 - Prime Minister John Major announces that the Queen will begin paying taxes on her personal income. Her personal fortune is estimated to be $11.7 billion.
April 1993 - Taxation of the Queen and Prince Charles goes into effect with the provision that they may "opt-out" of the agreement anytime after April 1994.
August 1993 - Buckingham Palace is opened to the public for the first time. Money raised from the tours is to help pay for the restoration of Windsor Castle.
December 1995 - After heavy media coverage of the estrangement and affairs of the Prince and Princess of Wales, the Queen urges them to divorce.
1997 - The Queen addresses the nation via live television to express grief over the death of Princess Diana.
1998 - The Queen endorses a plan to end gender discrimination in the line of succession for the throne.
2002 - The Queen celebrates her Golden Jubilee, or 50th anniversary, on the throne.
December 2006 - The Queen issues her annual Christmas broadcast live for the first time since 1960.
May 3-8, 2007 - The Queen and Prince Philip visit the United States for the 400th anniversary of America's first settlement by a British company in Jamestown in 1607. They attend the Kentucky Derby on May 5 and a State Dinner at the White House on May 7.
April 2, 2009 - Meets Michelle Obama at Buckingham Palace and the ladies are photographed with their arms around one another. Touching the queen is not a typical occurrence and causes lots of media attention and speculation as whose arm was on whom first.
July 6, 2010 - Addresses the General Assembly of the United Nations for the second time.
April 21, 2011 - On the Queen's 85th birthday, the palace releases the Queen's official consent, the Instrument of Consent, to the wedding of Prince William and Kate Middleton. By law, Royal Marriages Act of 1772, the monarch must consent to most royal marriages.
May 17, 2011 - Makes the first state visit to the Republic of Ireland by a British monarch.
February 6-June 5, 2012 - Celebrations take place throughout the United Kingdom and the Commonwealth for the Queen's Diamond Jubilee, or 60th anniversary, on the throne. Festivities highlights include a 1,000 boat flotilla along the River Thames and a concert at Buckingham Palace.
November 20, 2012 - The Queen and Prince Philip celebrate their 65th wedding anniversary.
December 18, 2012 - Queen Elizabeth II attends a cabinet meeting at 10 Downing St, marking the end of the celebration of her Diamond Jubilee. It is the first time a British monarch has attended a cabinet meeting in more than 100 years.
March 3-4, 2013 - Is admitted to King Edward VII's Hospital after experiencing symptoms of gastroenteritis. She is released the following day.
June 2, 2013 - Services at Westminster Abbey mark the 60th anniversary of the Queen's coronation.
June 20, 2013 - The Royal Ascot signature race is won by Estimate, the Queen's horse. The Gold Cup win makes the Queen the first reigning British monarch to win Ascot's biggest race.
April 8, 2014 - The Queen hosts a state dinner for Ireland's president Michael D. Higgins and his wife Sabina. Also in attendance are actors Daniel Day-Lewis and Dame Judi Dench. Martin McGuinness, former IRA commander and current Northern Ireland's Deputy First Minister, also attended.
Current line of succession:
1. The Prince of Wales, Prince Charles (1948)
2. The Duke of Cambridge, Prince William, eldest son of Prince Charles (1982)
3. Prince George of Cambridge, son of Prince William (2013)
4. Princess Charlotte of Cambridge, daughter of Prince William (2015)
5. Prince Henry of Wales, younger son of Prince Charles (1984)
6.The Duke of York, Prince Andrew, second son of Queen Elizabeth II (1960)
7. Princess Beatrice of York, elder daughter of Prince Andrew (1988)
8. Princess Eugenie of York, younger daughter of Prince Andrew (1990)
9. The Earl of Wessex, Prince Edward, youngest son of Queen Elizabeth II (1964)
10. Viscount Severn, James Windsor, son of Edward, The Earl of Wessex (2002)