Constantine I of Greece King of Greece (r. 1913–17; 1920–22) (1868–1923) Parents Olga Constantinovna of Russia George I of Greece Children Alexander of Greece Princess Irene, Duchess of Aosta George II of Greece Paul of Greece Helen of Greece and Denmark Princess Katherine of Greece and Denmark Siblings Princess Olga of Greece and Denmark Prince Andrew of Greece and Denmark Princess Alexandra of Greece and Denmark Prince Christopher of Greece and Denmark Princess Maria of Greece and Denmark Prince George of Greece and Denmark Prince Nicholas of Greece and Denmark Partners Sophia of Prussia
