Queen Elizabeth II took the throne on 6 February 1952 following the death of her father, King George VI.
The then 25-year-old, christened Elizabeth Alexandra Mary, was staying in a remote part of Kenya when she received the news.
She immediately flew back home to Britain as Queen, where she was greeted by Prime Minister Winston Churchill.
Her coronation took place on 2 June 1953, and was broadcast on television for the very first time.
During her reign, she has travelled more widely than any other monarch in history.
She has links with more than 600 charities, military associations, professional bodies and public service organisations
In September 2015, she became the longest-reigning UK monarch in history.