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1st February 1963: King Constantine II of the Hellenes (as Prince Constantine) and his fiancee Queen Anne-Marie of the Hellenes (as Princess Anne-Marie) at the Acropolis, Athens. (Photo by Keystone/Getty Images)

1st February 1963:  King Constantine II of the Hellenes (as Prince Constantine) and his fiancee Queen Anne-Marie of the Hellenes (as Princess Anne-Marie) at the Acropolis, Athens.  (Photo by Keystone/Getty Images)

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King Constantine of Greece and Princess Anne Marie on their wedding day, at Athens Orthodox Cathedral, September 19th 1964. (Photo by Central Press/Hulton Archive/Getty Images)

King Constantine of Greece and Princess Anne Marie on their wedding day, at Athens Orthodox Cathedral, September 19th 1964. (Photo by Central Press/Hulton Archive/Getty Images)

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1966: King Constantine of Greece and Queen Anne- Marie with their daughter Princess Alexia at Castle Tatoi, Greece. He was exiled in December 1967 and formally deposed in June 1973. The monarchy was abolished by national referendum in 1974. (Photo by Keystone/Getty Images)

1966:  King Constantine of Greece and Queen Anne- Marie with their daughter Princess Alexia at Castle Tatoi, Greece. He was exiled in December 1967 and formally deposed in June 1973. The monarchy was abolished by national referendum in 1974.  (Photo by Keystone/Getty Images)

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GREECE - OCTOBER 01: Constantine of Greece and his wife Anne Marie with their children, Alexis, Paul and the third born, Nicholas - Date of Photo: 1969 ca. (Photo by Team/Alinari via Getty Images)

GREECE - OCTOBER 01:  Constantine of Greece and his wife Anne Marie with their children, Alexis, Paul and the third born, Nicholas - Date of Photo: 1969 ca.  (Photo by Team/Alinari via Getty Images)

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GREAT BRITAIN - JULY 10: Members of the Greek Royal Family attend the christening of Prince Philippos of Greece, L to R: Princess Theodora with Queen Anne-marie of Greece and a nurse holding Prince Philippos (Photo by Tim Graham Photo Library via Getty Images)

GREAT BRITAIN - JULY 10:  Members of the Greek Royal Family attend the christening of Prince Philippos of Greece, L to R: Princess Theodora with Queen Anne-marie of Greece and a nurse holding Prince Philippos  (Photo by Tim Graham Photo Library via Getty Images)