The anniversary was was marked with a 41-gun salute
Britain's Queen Elizabeth II has reached another milestone in her reign: her sapphire jubilee.
She is now 65 years on the throne, making her the longest serving British monarch in history.
On February 6th 1952, her father King George VI died following an illness.
The then-Princess Elizabeth immediately acceded to the throne, becoming Queen Elizabeth II.
The anniversary was marked Monday with a 41-gun salute in London's Green Park, and another 62-round gun salute at the Tower of London.
However, she is not expected to celebrate publicly.
Buckingham Palace also released a photo of Queen Elizabeth, taken in 2014.
In the photograph, she is wearing sapphire jewellery given to her by King George VI as a wedding gift in 1947.
She surpassed Queen Victoria as Britain's longest-serving monarch in 2015.
She also celebrated her 90th birthday last April.
Queen Elizabeth II made a historic visit to Ireland back in 2011 - while President Michael D Higgins returned the favour when he went to London for a State visit in 2014.
Archive footage from 1952 shows a young Queen Elizabeth II meeting ministers: