The King Henry VIII gate at Windsor Castle Windsor, England, Tuesday, April 13, 2021, guarded by armed police and casket wardens. Britain's Prince Philip, husband of Queen Elizabeth II, died Friday April 9 aged 99. His funeral service will take place on Saturday at Windsor Castle. (AP Photo/Alastair Grant)

FILE - In this file photo dated Saturday, June 16, 2012, Britain's Queen Elizabeth II, and Prince Philip take a salute as the Guards march past outside Buckingham Palace after the Trooping The Color parade at Horse Guards Parade in London. Trooping the Colour is an annual ceremony marking the queen's official birthday, which takes place in June. The monarch's actual birthday was on 21 April, when she turned 86. Prince Philip who died Friday April 9, 2021, aged 99, lived through a tumultuous century of war and upheavals, but he helped forge a period of stability for the British monarchy under his wife, Queen Elizabeth II. (AP Photo/Sang Tan, FILE)