BRITAIN-ROYAL-TROOPING

Britain's Princess Eugenie of York (L0 and Britain's Sophie, Countess of Wessex, travel in a horse-drawn carriage down The Mall to Horseguards parade ahead of her Birthday Parade, 'Trooping the Colour', in London on June 9, 2018. - The ceremony of Trooping the Colour is believed to have first been performed during the reign of King Charles II. In 1748, it was decided that the parade would be used to mark the official birthday of the Sovereign. More than 600 guardsmen and cavalry make up the parade, a celebration of the Sovereign's official birthday, although the Queen's actual birthday is on 21 April. (Photo by Niklas HALLE'N / AFP) (Photo credit should read NIKLAS HALLE'N/AFP via Getty Images)