The Duke of Edinburgh, Prince Philip, has died at the age of 99 at Windsor Castle, it has been announced.
The Queen's husband spent a month in hospital earlier this year receiving treatment for an infection and also underwent an operation on a pre-existing heart condition.
In a statement, Buckingham Palace said: "It is with deep sorrow that Her Majesty The Queen has announced the death of her beloved husband, His Royal Highness The Prince Philip, Duke of Edinburgh.
"His Royal Highness passed away peacefully this morning at Windsor Castle.
"The Royal Family join with people around the world in mourning his loss."
Philip was the longest-lived male member of the Royal Family in history and was married to The Queen for 73 years, together with whom he had four children - Prince Charles, Princess Anne, Prince Andrew and Prince Edward.
The Duke was active in Royal service until 2017 when, at the age of 96, he officially retired after completing more than 22,000 solo engagements.
The UK will now enter a period of national mourning ahead of Philip's funeral, the plans for which are known as Operation Forth Bridge, while The Queen will suspend all official engagements for the foreseeable future.
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