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Former King of Greece Constantine II and Queen Anne-Marie, arrive for the memorial service of Constantine Mitsotakis, at the Athens cathedral on May 31, 2017. The former conservative prime minister died this week aged 98. (Photo by Panayotis Tzamaros/NurPhoto via Getty Images)

Former King of Greece Constantine II  and Queen Anne-Marie, arrive for the memorial service of Constantine Mitsotakis, at the Athens cathedral on May 31, 2017. The former conservative prime minister died this week aged 98.  (Photo by Panayotis Tzamaros/NurPhoto via Getty Images)

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Former King of Greece Constantine II and Queen Anne-Marie, arrive for the memorial service of Constantine Mitsotakis, at the Athens cathedral on May 31, 2017. The former conservative prime minister died this week aged 98. (Photo by Panayotis Tzamaros/NurPhoto via Getty Images)

Former King of Greece Constantine II  and Queen Anne-Marie, arrive for the memorial service of Constantine Mitsotakis, at the Athens cathedral on May 31, 2017. The former conservative prime minister died this week aged 98.  (Photo by Panayotis Tzamaros/NurPhoto via Getty Images)