- Son of King George of Greece and Queen Olga. Father of Elena of Greece and Denmark. Grandfather of King Michael, and Princess Alexandra of Greece and Denmark. Great-grandfather of Crown Prince Alexander of Serbia.
- His wife was the grand-daughter of Queen Victoria and Prince Albert, the sister of Kaiser Wilhelm II and Prince Henry of Prussia, and the aunt of Crown Prince Hohenzollern and Viktoria Luise von Preußen.
- King of Greece from March 18, 1913 to June 11, 1917, and from December 19, 1920 to September 27, 1922.
- His son, King George II of Greece, married Princess Elisabeth of Romania, the daughter of King Ferdinand of Romania and Queen Marie of Romania. Constantine's daughter, Elena, married Elisabeth's brother, King Carol II.
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