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BELGIUM - MARCH 22: Prince Leopold And Princess Astrid Of Belgium Making Their Joyeuse Entree In The City Of Anvers, On July 21, The Belgian National Day, In 1928. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

BELGIUM - MARCH 22:  Prince Leopold And Princess Astrid Of Belgium Making Their Joyeuse Entree In The City Of Anvers, On July 21, The Belgian National Day, In 1928.  (Photo by Keystone-France/Gamma-Keystone via Getty Images)