Britain's Queen Elizabeth II takes her seat for the funeral of Britain's Prince Philip, who died at the age of 99, at St George's Chapel, in Windsor, Britain, April 17, 2021. Victoria Jones/Pool via REUTERS TPX IMAGES OF THE DAY 

Britain's Prince Charles, Prince of Wales, and Camilla, Duchess of Cornwall, pose in front of the Sphinx, on the outskirts of Cairo, Egypt, November 18, 2021. REUTERS/Peter Nicholls TPX IMAGES OF THE DAY 

Britain's Prince William, The Duke of Cambridge, and Prince Harry, Duke of Sussex, look at a statue they commissioned of their mother Diana, Princess of Wales, in the Sunken Garden at Kensington Palace, London, Britain July 1, 2021. Dominic Lipinski/Pool via REUTERS TPX IMAGES OF THE DAY 

Mako Komuro, former Japan's Princess Mako and the eldest daughter of Crown Prince Akishino and Crown Princess Kiko, is seen before she and her newly married husband Kei before they board a flight bound for New York to start their new life in the U.S. at Haneda airport in Tokyo, Japan November 14, 2021. REUTERS/Issei Kato TPX IMAGES OF THE DAY 

Britain's Catherine, Duchess of Cambridge arrives at a reception to meet parents of users of a Centre for Early Childhood in the grounds of Kensington Palace in London, Britain, June 18, 2021. REUTERS/Toby Melville/Pool TPX IMAGES OF THE DAY 

Britain's Prime Minister Boris Johnson and Abu Dhabi's Crown Prince Sheikh Mohammed bin Zayed al-Nahyan inspect the Grenadier Guard in London, Britain, September 16, 2021. REUTERS/Hannah McKay/Pool TPX IMAGES OF THE DAY 

Britain's Queen Elizabeth attends a ceremony marking her official birthday in the Quadrangle of Windsor Castle in Windsor, Britain June 12, 2021. Chris Jackson/Pool via REUTERS TPX IMAGES OF THE DAY 

Britain's Prince Harry and Meghan, Duke and Duchess of Sussex, visit the 9/11 Memorial in Manhattan, New York City, U.S., September 23, 2021. REUTERS/Andrew Kelly TPX IMAGES OF THE DAY 

Britain's Catherine, Duchess of Cambridge, looks on as she sits in a car during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Chris Jackson/Pool via REUTERS TPX IMAGES OF THE DAY 

Britain's Prince Philip leaves King Edward VII's Hospital in London, Britain March 16, 2021. REUTERS/Peter Cziborra TPX IMAGES OF THE DAY 

Britain's Prince Harry, Duke of Sussex looks on during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, at St George's Chapel, in Windsor, Britain, April 17, 2021. Yui Mok/Pool via REUTERS TPX IMAGES OF THE DAY 

An announcement is attached to the fence of Buckingham Palace after it was announced that Britain's Prince Philip, husband of Queen Elizabeth, has died at the age of 99, in London, Britain, April 9, 2021. REUTERS/Hannah McKay TPX IMAGES OF THE DAY 

Catherine, Duchess of Cambridge rides a land yacht at the beach in St Andrews, Scotland, Britain, May 26, 2021. REUTERS/Phil Noble/Pool TPX IMAGES OF THE DAY 

Members of the Royal Collection Trust staff pose for a photograph with the oil on canvas portrait, HRH The Prince Philip, Duke of Edinburgh, 2017, by Ralph Heimans, which forms part of the Prince Philip: A Celebration display in Windsor Castle, Britain, June 24, 2021. REUTERS/Peter Nicholls TPX IMAGES OF THE DAY 

Britain's Catherine, Duchess of Cambridge, reacts during golf with young people supported by the Cheesy Waffles Project, a charity for children, young people and adults with additional needs across County Durham, at the Belmont Community Centre, Britain April 27, 2021. Andy Commins/Pool via REUTERS TPX IMAGES OF THE DAY 

Britain's Prince William, Duke of Cambridge, visits the Brighter Futures in Rhyl, Denbighshire, Britain May 6, 2021. Peter Byrne/Pool via REUTERS 

Thailand's King Maha Vajiralongkorn, Queen Suthida, and Princess Sirivannavari Nariratana arrive at a groundbreaking ceremony for a monument of late King Bhumibol Adulyadej at a park in Bangkok, Thailand, December 5, 2021. REUTERS/Chalinee Thirasupa 

Britain's Prince Harry and Meghan Markle appear onstage at the 2021 Global Citizen Live concert at Central Park in New York, U.S., September 25, 2021. REUTERS/Caitlin Ochs 

The hearse, a specially modified Land Rover, Britain's Prince Charles and members of the Royal Family walk near St George's Chapel during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, on the grounds of Windsor Castle in Windsor, Britain, April 17, 2021. REUTERS/Hannah McKay/Pool TPX IMAGES OF THE DAY 

Britain's Prince Charles (known as the Duke of Rothesay when in Scotland) looks on as he visits the Johnnie Walker Princes Street to officially open the new global visitor experience in Edinburgh, Scotland, Britain October 1, 2021. Jane Barlow/Pool via REUTERS TPX IMAGES OF THE DAY 

Mako Komuro, former Japan's Princess Mako and the eldest daughter of Crown Prince Akishino and Crown Princess Kiko, and her newly married husband Kei board a flight bound for New York to start their new life in the U.S. at Haneda airport in Tokyo, Japan November 14, 2021. REUTERS/Issei Kato TPX IMAGES OF THE DAY 

Britain's Prince William (not pictured) and Catherine, Duchess of Cambridge celebrate the Scouts #PromiseToThePlanet campaign during a visit to 105th Glasgow Scouts, at the Alexandra Sports Hub, on the sidelines of the UN Climate Change Conference (COP26) in Glasgow, Scotland, Britain, November 1, 2021. Victoria Stewart/Pools via REUTERS TPX IMAGES OF THE DAY 

Britain's Prince William, Duke of Cambridge and Britain's Prince Harry, Duke of Sussex enter St George's Chapel, Windsor Castle, during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, in Windsor, Britain, April 17, 2021. Danny Lawson/Pool via REUTERS TPX IMAGES OF THE DAY 

Prince Albert II of Monaco, Prince Jacques and Princess Gabriella holding message which read "We miss you mommy" and "We love you mommy", stand on the palace balcony during the celebrations marking Monaco's National Day in Monaco, November 19, 2021. REUTERS/Eric Gaillard TPX IMAGES OF THE DAY 

Britain's Prince William, Duke of Cambridge, salutes veterans marching past on Horse Guards Parade during the annual National Service of Remembrance in Whitehall, London, Britain, November 14, 2021. Daniel Leal/Pool via REUTERS TPX IMAGES OF THE DAY 

Britain's Prince William and Catherine, Duchess of Cambridge, arrive at the Earthshot awards ceremony in London, Britain October 17, 2021. REUTERS/Henry Nicholls TPX IMAGES OF THE DAY 

Britain's Queen Elizabeth meets actors and members of the production team during a visit to the set of the long running television series 'Coronation Street', in Manchester, Britain, July 8, 2021. Scott Heppell/Pool via REUTERS TPX IMAGES OF THE DAY 

Britain's Queen Elizabeth and Anne, Princess Royal gather around a grill as they visit a community project in Glasgow, as part of the Queen's traditional trip to Scotland for Holyrood Week, June 30, 2021. Andrew Milligan/Pool via REUTERS TPX IMAGES OF THE DAY 

U.S. President Joe Biden walks in front of Britain's Queen Elizabeth, at Windsor Castle in Windsor, Britain, June 13, 2021. REUTERS/Dylan Martinez TPX IMAGES OF THE DAY 

Britain's Prince Charles walks behind the hearse, a specially modified Land Rover, during the funeral of Britain's Prince Philip, husband of Queen Elizabeth, who died at the age of 99, on the grounds of Windsor Castle in Windsor, Britain, April 17, 2021. REUTERS/Hannah McKay/Pool TPX IMAGES OF THE DAY