Constantine I1868 - 1923 Born Sun, 2 August 1868 Athens Died Thu, 11 January 1923 Palermo Buried Tatoi Palace, Athens Details Parents King of Greece Κωνσταντίνος Αʹ, Konstantínos Lived 54 years, 5 months, 9 days father George I 1845 - 1913 mother Olga Constantinovna of Russia 1851 - 1926 Siblings Brother George of Greece and Denmark 1869 - 1957 Sister Alexandra of Greece and Denmark 1870 - 1891 Brother Nicholas of Greece and Denmark 1872 - 1938 Sister Maria of Greece and Denmark 1876 - 1940 Sister Olga of Greece and Denmark 1880 Brother Andrew of Greece and Denmark 1882 - 1944 Brother Christopher of Greece and Denmark 1888 - 1940