The Duke of Edinburgh has enjoyed good health into his old age and has stood steadfastly by the Queen’s side ever since she took the throne in 1952.
With the royal about to retire, here is a look at how the nation will one day have to cope with coming to terms with his death.
What will happen when Prince Philip dies?
Britain will enter a period of mourning when the Duke of Edinburgh eventually dies and leaves his beloved wife behind.
In the event of the his death, Buckingham Palace will inform the BBC and they will be the first to break the news.
If Philip dies overnight then the announcement will likely come at 8am the next morning.
Detailed arrangements have been made for when the Queen dies, but what happens when Prince Philip dies is less clear.
Flags across the country will be lowered to half-mast as the Queen enters a period of mourning - believed to last eight days - for her husband.
But the Royal Standard flag, above Buckingham Palace, will not be lowered because it represents the monarchy, which is continuous.
During Queen Elizabeth II’s days of mourning, no laws will be given the Royal Assent and the affairs of the state will be suspended.
The Queen will take time to mourn privately before returning to public duties.
The Queen’s consort is entitled to a state funeral, but the Duke has previously stated he does not want the “fuss”.
Philip could instead opt for a military style funeral at St George’s Chapel. He will be buried in Frogmore Gardens in the grounds of Windsor Castle, according to the Independent.
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