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The royal court of Monaco, the prince Rainier III (Ranier Louis Henri Maxence Bertrand Grimaldi) and his wife the American actress and princess Grace Kelly posing on the balcony of the embassy of the Principality of Monaco while visiting Rome. Rome, June 1959 (Photo by Pierluigi Praturlon\Reporters Associati & Archivi\Mondadori Portfolio via Getty Images)

The royal court of Monaco, the prince Rainier III (Ranier Louis Henri Maxence Bertrand Grimaldi) and his wife the American actress and princess Grace Kelly posing on the balcony of the embassy of the Principality of Monaco while visiting Rome. Rome, June 1959   (Photo by Pierluigi Praturlon\Reporters Associati & Archivi\Mondadori Portfolio via Getty Images)