Official Royal Engagement Between Prince Constantine Of Greece And Princess Anne-Marie Of Denmark... [Getty Images]

COPENHAGEN, DENMARK - JANUARY 26: Official Royal Engagement Between Prince Constantine Of Greece And Princess Anne-Marie Of Denmark In Presence Of King Frederik IX And Queen Ingrid Of Denmark And King Paul And Queen Frederika Of Greece, in Copenhagen, Denmark, on January 21, 1963. (Photo by Keystone-France/Gamma-Rapho via Getty Images)

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