Elizabeth II, Elizabeth Alexandra Mary, was born on 21 April 1926
Elizabeth was born in London to the Duke and Duchess of York, later King George VI and Queen Elizabeth
In 1947, she married Philip, Duke of Edinburgh, with whom she has four children: Charles, Anne, Andrew, and Edward.
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 in world history
Times of personal significance have included the births and marriages of her children, grandchildren and great grandchildren, her coronation in 1953, and the celebration of milestones such as her Silver, Golden and Diamond Jubilees in 1977, 2002, and 2012, respectively.
Moments of sadness for her include the death of her father, aged 56; the assassination of Prince Philip's uncle, Lord Mountbatten; the breakdown of her children's marriages in 1992; the death in 1997 of her son's former wife, Diana, Princess of Wales; and the deaths of her mother and sister in 2002
Her Diamond Jubilee in 2012 marked 60 years on the throne
On 3 March 2013, Elizabeth was admitted to the King Edward VII Hospital as a precaution after developing symptoms of gastroenteritis
She is the longest-reigning queen regnant in history, the world's oldest reigning monarch and second-longest-serving current head of state, after King Bhumibol Adulyadej of Thailand
The Queen does not intend to abdicate, though Prince Charles is expected to take on more of her workload as Elizabeth, who celebrated her ninetieth birthday in 2016, carries out fewer public engagements
Elizabeth has held many titles and honorary military positions throughout the Commonwealth, is Sovereign of many orders in her own countries, and has received honours and awards from around the world