Princess Elizabeth, then aged 25, was visiting Kenya with her husband, Prince Philip, when her father, king George VI, died aged 56 on February 6, 1952.
She cut her trip short and rushed back to Britain.
Queen Elizabeth II's coronation did not happen until the following year. She was crowned at Westminster Abbey on June 2, 1953, in front of 8,500 assembled guests.
The ceremony was the first major televised international event and led to a surge in sales for television sets.
The Queen's 25 years on the throne saw her reaffirm the vow of lifelong service to Britain and the Commonwealth she had made in a speech aged 21 in 1947.
She toured the country and the Commonwealth. Celebratory street parties provided some respite from the economic gloom at home, marked by industrial decline and strikes.
The Queen's eldest son and heir, Prince Charles, separated from Princess Diana, and her second son, Prince Andrew, split from his wife, Sarah.
Her only daughter, Princess Anne, divorced her husband, Mark Phillips. Windsor Castle, her favoured home west of London, was also seriously damaged by fire.
The Queen called the 12 months her "annus horribilis".
Diana's death in a car crash on August 31, 1997 rocked the royal family to the core, provoking rare criticism of the Queen for staying at her Balmoral estate in Scotland.
She eventually returned, the Union Jack was lowered to half-mast at Buckingham Palace, and the Queen made a televised tribute to Diana, helping to calm public anger.
The monarch celebrated her Platinum Jubilee in style. To celebrate the queen's 70 years in service, Britain embarked on four days of celebrations on June 2 this year. The special occasion was marked by several events such as Trooping the Colour, a Platinum Jubilee concert, a pageant, and a Service of Thanksgiving.
The longest-reigning monarch of the United Kingdom passed away on September 8, 2022. The Queen had been dealing with some health-related problems for a while now and she had to heavily cut down on public appearances due to the same. She was at her Balmoral Castle in Aberdeenshire, Scotland when she took her last breath.