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YUGOSLAVIA - OCTOBER 22: Prince Paul Of Serbia, The Future Regent Of Yugoslavia, Married Princess Olga Of Greece And Denmark On October 22, 1923. They Are Pictured Here On The Front Steps Of The Royal Palace In Belgrade. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

YUGOSLAVIA - OCTOBER 22:  Prince Paul Of Serbia, The Future Regent Of Yugoslavia, Married Princess Olga Of Greece And Denmark On October 22, 1923. They Are Pictured Here On The Front Steps Of The Royal Palace In Belgrade.  (Photo by Keystone-France/Gamma-Keystone via Getty Images)