The 99-year-old royal passed away just months before his 100th birthday in June. He had retired from public duties in 2017 at the age of 96.
The Royal Family, in a statement, announced the news, saying, "It is with deep sorrow that Her Majesty The Queen announces 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."
Adding that further announcements would be made in due course.
"The Royal Family join with people around the world in mourning his loss," the statement concluded.
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It is with deep sorrow that Her Majesty The Queen has announced the death of her beloved husband, His Royal Highnes… https://t.co/7cHe9dWPK0
— The Royal Family (@RoyalFamily) 1617966068000
The Duke of Edinburgh, born in 1921, had been hospitalised to the private King Edward VII's Hospital in London on Feb. 16, where he was treated for an infection. He was later transferred to a specialized cardiac care hospital, St. Bartholomew's, for a short stay, before returning to King Edward VII's, and being discharged to return home on March 16.
In this Aug. 1951 file photo, Princess Elizabeth stands with her husband the Duke of Edinburgh and their children Prince Charles and Princess Anne at the couple's London residence at Clarence House. A leading figure in the British royal family for almost seven decades, the former navy commander 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.
In this file photo taken on June 13, 2015 Britain's Queen Elizabeth II (front CL) and her husband Prince Philip, Duke of Edinburgh (front CR) wave as they stand on the balcony of Buckingham Palace with (L-R) Britain's Camilla, Duchess of Cornwall, Britain's Prince Charles, Prince of Wales, Britain's Prince William, Duke of Cambridge holding his son Prince George of Cambridge, Catherine, Duchess of Cambridge (back), Prince Harry, James, Viscount Severn, Prince Andrew, Duke of York (back), Princess Beatrice of York, Lady Louise Windsor, Princess Eugenie of York at the end of the Queen's Birthday Parade, 'Trooping the Colour,' in London on June 13, 2015.
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A Greek prince, he married Elizabeth in 1947 playing a key role in modernising the monarchy in the post-World War II period, and behind the walls of Buckingham Palace being the one key figure the queen could turn to and trust.
