Live: Tributes paid after Prince Philip dies at Windsor Castle at the age of 99 The Duke of Edinburgh passed away peacefully at Windsor Castle this morning (April 9) The video will auto-play soon8Cancel Play now Prince Philip, the Duke of Edinburgh, has died at the age of 99, Buckingham Palace has confirmed. The Duke of Edinburgh passed away peacefully at Windsor Castle this morning (April 9). A statement from Buckingham Palace read: “It is with deep sorrow that Her Majesty The Queen has announced the death of her beloved husband, His Royal Highness Prince Philip, Duke of Edinburgh. "His Royal Highness passed away peacefully this morning at Windsor Castle.”