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Empress Nam Phuong, wife of Emperor Bao Dai of Vietnam, waiting to be received by the Pope during a visit to the Vatican, Italy, July 28th 1954. (Photo by Keystone/Hulton Archive/Getty Images)

Empress Nam Phuong, wife of Emperor Bao Dai of Vietnam, waiting to be received by the Pope during a visit to the Vatican, Italy, July 28th 1954. (Photo by Keystone/Hulton Archive/Getty Images)