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Queen Elizabeth II and Prince Philip meeting King Juan Carlos I of Spain, Queen Sofia of Spain and their son Felipe, Prince of Asturias, at the Palacio Real de Madrid, in Madrid, for a state banquet in Spain, 18 October 1988. (Photo by Tim Graham/Getty Images)

Queen Elizabeth II and Prince Philip meeting King Juan Carlos I of Spain, Queen Sofia of Spain and their son Felipe, Prince of Asturias, at the Palacio Real de Madrid, in Madrid, for a state banquet in Spain, 18 October 1988. (Photo by Tim Graham/Getty Images)