WINDSOR, ENGLAND - JUNE 15: Prince Charles, Prince of Wales, Camilla, Duchess of Cornwall, Sophie, Countess of Wessex, Prince William, Duke of Cambridge and Prince Edward, Earl of Wessex leave after the Order of the Garter Service at St George's Chapel in Windsor Castle on June 15, 2015 in Windsor, England. The Order of the Garter is the most senior and the oldest British Order of Chivalry and was founded by Edward III in 1348.  (Photo by Stefan Rousseau - WPA Pool /Getty Images)