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circa 1947: From left, Princess Sofia of Spain, (1938 - ), Crown Prince Constantine II of the Hellenes, (1940 - ), and Princess Irene of Greece, in the garden of their home in Psychiko. They are the children of King Paul I and Queen Frederica. (Photo by Topical Press Agency/Getty Images)

circa 1947:  From left, Princess Sofia of Spain, (1938 -      ), Crown Prince Constantine II of the Hellenes, (1940 -       ), and Princess Irene of Greece,  in the garden of their home in Psychiko.  They are the children of King Paul I and Queen Frederica.  (Photo by Topical Press Agency/Getty Images)

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King Consort Constantine of Greece driving a car with his sisters, Princesses Irene and Sophia, when they were all children, circa 1955. Printed following the announcement of his marriage to Princess Anne Marie on August 21st 1964. (Photo by Central Press/Hulton Archive/Getty Images)

King Consort Constantine of Greece driving a car with his sisters, Princesses Irene and Sophia, when they were all children, circa 1955. Printed following the announcement of his marriage to Princess Anne Marie on August 21st 1964. (Photo by Central Press/Hulton Archive/Getty Images)

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Royalty, King Paul and Queen Frederika of Greece with their three children, Crown Prince Constantine aged 6, Princess Sophia aged 8 and Princess Irene aged 4 at their home in Pyschiko, 1947 (Photo by Popperfoto via Getty Images/Getty Images)

Royalty, King Paul and Queen Frederika of Greece with their three children, Crown Prince Constantine aged 6, Princess Sophia aged 8 and Princess Irene aged 4 at their home in Pyschiko, 1947  (Photo by Popperfoto via Getty Images/Getty Images)