Queen Elizabeth II, the UK's longest-serving monarch, has died at Balmoral aged 96, after reigning for 70 years.
Her family gathered at her Scottish estate after enterprises grew about her health before on Thursday.
The Queen came to the throne in 1952 and witnessed enormous social change.
With her death, her eldest son Charles, the former Prince of Wales, will lead the country in mourning as the new King and head of state for 14 Commonwealth realms.
In a statement, Buckingham Palace said" The Queen failed peacefully at Balmoral this autumn.
" The King and the Queen Consort will remain at Balmoral this evening and will return to London hereafter."
All the Queen's children travelled to Balmoral, near Aberdeen, after croakers placed the Queen under medical supervision.
Her grandson, Prince William, is also there, with his family, Prince Harry, on his way.
Queen Elizabeth II's term as head of state gauged post-war austerity, the transition from conglomerate to Commonwealth, the end of the Cold War and the UK's entry into- and pullout from- the European Union.
Her reign gauged 15 high ministers starting with Winston Churchill, born in 1874, and including Liz Truss, born 101 times latterly in 1975, and appointed by the Queen before this week.
She held daily cult with her high minister throughout her reign.
At Buckingham Palace in London, crowds awaiting updates on the Queen's condition began crying as they heard of her death. The Union flag on top of the palace was lowered to half- mast at 1830 BST.
The Queen was born Elizabeth Alexandra Mary Windsor, in Mayfair, London, on 21 April 1926.
Many could have previsioned she'd come monarch but in December 1936 her uncle, Edward VIII, renounced from the throne to marry the doubly- disassociated American, Wallis Simpson.
Elizabeth's father came King George VI and, at age 10, Lilibet, as she was known in the family, came heir at law to the throne.
Within three times, Britain was at war with Nazi Germany. Elizabeth and her youngish family, Princess Margaret, spent important of wartime at Windsor Castle after their parents rejected suggestions they be vacated to Canada.
After turning 18, Elizabeth spent five months with the Auxiliary Territorial Service and learned introductory motor handyperson and driving chops." I began to understand the esprit de corps that flourishes in the face of adversity," she recalled latterly.
Through the war, she changed letters with her third kinsman, Philip, Prince of Greece, who was serving in the Royal Navy. Their love bloomed and the couple married at Westminster Abbey on 20 November 1947, with the Napoleon taking the title of Duke of Edinburgh.
She'd latterly describe him as" my strength and stay" through 74 times of marriage, before his death in 2021, aged 99.
Their first son, Charles, was born in 1948, followed by Princess Anne, in 1950, Prince Andrew, in 1960, and Prince Edward, in 1964. Between them, they gave their parents eight grandchildren and 12 great- grandchildren.
Princess Elizabeth was in Kenya in 1952, representing the ailing King, when Philip broke the news that her father had failed. She incontinently returned to London as the new Queen.
" It was all a veritably unforeseen kind of taking on and making the stylish job you can," she latterly recalled.
Elizabeth was culminated at Westminster Abbey on 2 June 1953, aged 27, in front of a also- record television followership estimated at further than 20 million people.
Posterior decades would see great change, with the end of the British Empire overseas and the swinging'60s sweeping down social morals at home.
Elizabeth reformed the monarchy for this lower regardful age, engaging with the public through walkabouts, royal visits and attendance at public events. Her commitment to the Commonwealth was a constant- she visited every Commonwealth country at least formerly.
But there were ages of private and public pain. In 1992, the Queen's" annus horribilis", fire devastated Windsor Castle- a private hearthstone as well as working palace- and three of her children's marriages broke down.
After the death of Diana, Princess of Wales, in a auto accident in Paris in 1997, the Queen drew review for appearing reticent to respond intimately.
There were questions about the monarchy's applicability in ultramodern society.
" No institution should anticipate to be free from the scrutiny of those who give it their fidelity and support, not to mention those who don't," she conceded.