Constantine I of Greece

King of Greece (r. 1913–17; 1920–22) (1868–1923)

Parents

• Olga Constantinovna of Russia
• George I of Greece

Children

• George II of Greece
• Alexander of Greece
• Princess Irene, Duchess of Aosta
• Paul of Greece
• Princess Katherine of Greece and Denmark
• Helen of Greece and Denmark

Siblings

• Prince Andrew of Greece and Denmark
• Prince George of Greece and Denmark
• Prince Nicholas of Greece and Denmark
• Princess Maria of Greece and Denmark
• Princess Alexandra of Greece and Denmark
• Prince Christopher of Greece and Denmark
• Princess Olga of Greece and Denmark

Partners

• Sophia of Prussia