Prince Philip, Queen Elizabeth II, Queen Sofia of Spain, and King Juan Carlos I of Spain, at El Pardo Palace, in Madrid, for a state banquet in Spain, 18 October 1988. (Photo by Tim Graham Photo Library via Getty Images)
Prince Philip, Queen Elizabeth II, Queen Sofia of Spain, and King Juan Carlos I of Spain, at El Pardo Palace, in Madrid, for a state banquet in Spain, 18 October 1988. (Photo by Tim Graham Photo Library via Getty Images)