King Frederick IX of Denmark (1899-1972) with his wife, Queen Ingrid of Denmark (1910-2000), their daughter, Crown Princess Margrethe, and her husband Prince Henrik and their son, Frederik, Crown Prince of Denmark, in Copenhagen, Denmark, 11th March 1969. King Frederick was celebrating his 70th birthday. (Photo by Keystone/Getty Images)
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Hulton Royals Collection Keystone