(L-R) Britain's Princess Anne, Princess Royal, Britain's Prince George of Wales, Britain's Prince Louis of Wales, Britain's Catherine, Princess of Wales, Britain's Princess Charlotte of Wales and Britain's Prince William, Prince of Wales, come out to watch the fly-past of aircraft by the Britain's Royal Air Force (RAF) from the balcony of Buckingham Palace after attending the King's Birthday Parade, 'Trooping the Colour', in London on June 17, 2023. The ceremony of Trooping the Colour is believed to have first been performed during the reign of King Charles II. Since 1748, the Trooping of the Colour has marked the official birthday of the British Sovereign. Over 1500 parading soldiers and almost 300 horses take part in the event. (Photo by Adrian DENNIS / AFP)(ADRIAN DENNIS)