Queen Elizabeth II, who ruled the UK for 70 years, passed away at Balmoral at the age of 96.
After worries about her health grew earlier on Thursday, her family gathered at her Scottish estate.
The Queen saw significant social change after ascending to the throne in 1952.
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After her passing, her eldest son Charles, the former Prince of Wales, would take the throne as the new King and ruler of 14 Commonwealth states, leading the nation in grief.
Buckingham Palace issued a statement that read: "The Queen passed away peacefully at Balmoral this afternoon.
The King and the Queen Consort will spend this evening and tomorrow in Balmoral before traveling back to London.
Following the Queen's placement under medical supervision, all of her children made their way to Balmoral, which is close to Aberdeen.
Prince William, her grandson, is also present, and Prince Harry is en route.
The reign of Queen Elizabeth II as head of state covered the post-World War II period of austerity, the change from an empire to a Commonwealth, the end of the Cold War, and the UK's membership in - and exit from - the European Union.
15 prime ministers served during her reign, including Liz Truss, who was chosen by the Queen earlier this week and was born 101 years after Winston Churchill in 1975.
Throughout her rule, she met with her prime minister on a weekly basis.
Crowds waiting for information on the Queen's condition at Buckingham Palace in London started wailing when they learned of her passing.
Elizabeth Alexandra Mary Windsor was born the Queen on April 21, 1926, in Mayfair, London.
TAG: UK Queen Elizabeth II Dead
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