In February 1952, the then Princess Elizabeth arrived in Kenya for an official visit.
She left as queen.
With the death of her father, King George VI, back in London, Elizabeth automatically assumed the throne, beginning a historic seven-decade reign until Sunday.
The Queen is the first British monarch to celebrate her so-called Platinum Jubilee, marking 70 years on the throne. During that time, 14 Prime Ministers led the British government.
On Sunday, Buckingham Palace released a new photo of the 95-year-old queen to commemorate her jubilee, showing her smiling next to a portrait of her late father and a red box in which she receives briefing papers.