WINDSOR, ENGLAND - JUNE 15: Camilla, Duchess of Cornwall attends 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 Eddie Mulholland - WPA Pool /Getty Images)