In 65 years as consort to the Queen, the Duke of Edinburgh has accompanied her on royal tours and supported her work as well as attending thousands of events of his own.
They were abroad, in Kenya, in February 1952 when George VI passed away and Princess Elizabeth became Queen.
The couple's first tour of the Commonwealth, in 1953, covered 30,000 miles in six months across countries including Bermuda, Jamaica, Fiji and Tonga.
Prince Philip's most prominent interests include conservation, the military, and young people's education.
In 1956 he founded the Duke of Edinburgh Award scheme, which encourages teenagers to work in their local communities and explore the countryside.
A former naval officer, he has frequently praised the work of engineers and championed science and technology research.
Many of his 14 books are about the environment and how humans are affecting it.
In 1952, a year after leaving his job in the navy he was appointed Admiral of the Sea Cadet Corps, Colonel-in-Chief of the Army Cadet Force and Air Commodore-in-Chief of the Air Training Corps.
For more than 50 years, from 1959 to 2011, he also judged The Prince Philip Designers Prize, which rewarded architects and designers for innovation.