Now, a few weeks after celebrating his 96th birthday, the Duke of Edinburgh will today fulfil his final royal appointment before retreating from the limelight of a lifetime spent in public service.
The 1664 Global Challenge raises funds and awareness for The Royal Marines Charity, marking the symbolic significance of 1664 as the year in which the Corps was founded.
Buckingham Palace has stressed that although the Duke of Edinburgh's official diary will come to an end, he may still attend certain events alongside the Queen, whose public schedule will continue as normal.
UK Correspondent Rod Liddle told Mike Hosking he has done over 22,000 engagements by himself since 1952.
The Duke of Edinburgh will meet Royal Marines at Buckingham Palace on Wednesday in his final official engagement before he retires from public duty. The Royal Marines marched, gave a royal salute and the event closed off with three cheers for the Captain General - a symbolic finish, as Captain General was one of Prince Philip's oldest duties, handed to him in 1953.
Elizabeth has called Philip, her husband of nearly 70 years and the longest-serving consort in British history, "my strength and stay".
Venezuela's Maduro blames sanctions on United States imperialism
Maduro said in a speech on Wednesday, after the White House imposed sanctions against 13 current and former Venezuelan officials . The existing Supreme Court has consistently backed Maduro and shot down all measures by the opposition-led National Assembly.
Philip's wife, Queen Elizabeth, wasn't in attendance due to a prior commitment, but this won't be the last opportunity to see Philip by her side.
The palace said Philip may still choose to attend events alongside the queen.
"He's been such a stable character in all our lives - he's always there and he's always been there for the Queen and I think we're very, very lucky to have him" said Lady Myra Butler, who has known Philip since childhood, to the BBC.
An incomplete article was published by the newspaper's website with the headline "HOLD HOLD HOLD Prince Philip, Duke of Edinburgh dies age XX".
Prince Philip sits with the Queen as she delivers her speech in the House of Lords, during the State Opening of Parliament at the Palace of Westminster in London June 4, 2014.