Britain's Prince Philip through the years

The Duke of Edinburgh, as he was officially known, had been by his wife’s side throughout her 69-year reign, the longest in British history, during which time he earned a reputation for a tough, no-nonsense attitude and a propensity for occasional gaffes.

A Greek prince, he married Elizabeth in 1947 playing a key role in modernizing the monarchy in the post-World War Two period, and behind the walls of Buckingham Palace being the one key figure the queen could turn to and trust.