GREAT BRITAIN - MAY 01: Prince Philip, Duke of Edinburgh, standing on his Range Rover car at the Royal Windsor Horse Show (Photo by Tim Graham Photo Library via Getty Images)
WINDSOR, UNITED KINGDOM - MAY 13: Prince Philip At The Carriage Driving Championships In Windsor Great Park As Part Of The Royal Windsor Horse Show (Photo by Tim Graham Photo Library via Getty Images)
WINDSOR, ENGLAND - MAY 13: Prince Philip the Duke of Edinburgh on the third day of the Royal Windsor Horse Show, Windsor Great Park in the grounds of Windsor Castle on May 13, 2006 in Windsor, England. (Photo by Tim Graham Photo Library via Getty Images)
WINDSOR, UNITED KINGDOM - MAY 15: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince Philip, Duke of Edinburgh watches the Driving for the Disabled class as he attends day 2 of the Royal Windsor Horse Show at Home Park on May 15, 2014 in Windsor, England. (Photo by Max Mumby/Indigo/Getty Images)
WINDSOR, UNITED KINGDOM - MAY 15: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince Philip, Duke of Edinburgh carriage driving in the Laurent Perrier meet of the British Driving Society on day 5 of the Royal Windsor Horse Show on May 15, 2011 in Windsor, England. (Photo by Indigo/Getty Images)
