- Offered the throne by the Greek Assembly at age 17, and ruled Greece for the next 50 years as Georgios I, King of the Hellenes.
- Son of Christian IX. Brother of King Frederik VIII, Queen Alexandra, Czarina Maria Fyodorovna, Prinsesse Thyra, and Prins Valdemar.
- Had 8 children: King Constantine, George (1869-1957), Alexandra (1870-1891), Nicholas (1872-1938), Maria (1876-1940), Olga (1881), Andrew (1882-1944) and Christopher (1888-1940).
- Had 21 Grandchildren: Prince George (1890-1947, King George II of Greece),Prince Alexander (1893-1920, King Alexander of Greece), Elena of Greece and Denmark, Prince Paul (1901-1964, King Paul I of Greece), Princess Irene (1904-1974) and Princess Katherine (1913-2007, Constantine's children), Prince Peter (1908-1980) and Princess Eugenie (1910-1989, George's children), Grand Duchess Maria (1890-1958) and Grand Duke Dmitri (1891-1941, Alexandra's children), Princess Olga (1903-1997), Princess Elizabeth (1904-1955) and Princess Marina (1906-1968, Nicholas' daughters), Princess Nina (1901-1974) and Princess Xenia (1903-1965, Maria's daughters), Princess Margarita (1905-1981), Princess Theodora (1906-1969), Princess Cecilie (1911-1937), Princess Sophie (1914-2001) and Prince Philippos (1921-, Andrew's children) and Prince Michael (1939-, Christopher's son).
- Uncle of King George V, Tsar Nicholas II, King Christian X, King Haakon VII, Prince Albert Victor, Dronning Maud, and Prins Axel.
- Great-great-grandfather of Juan Urdangarín Borbón, Pablo Urdangarín Borbón, Miguel Urdangarín Borbón, Felipe Juan Froilán de Marichalar y Borbón, and Victoria Federica de Marichalar y Borbón.
- Grandfather of Prince Philip, Prince Michael of Greece, and H.R.H. Prince Peter of Greece. Great-grandfather of King Michael, Princess Irene of Greece, Sofía de Grecia, and King Constantine II. 2nd great-grandfather of Prince Nikolaos, Elena de Borbón, Cristina de Borbón, Crown Prince of Greece Pavlos, Theodora Greece, King Felipe VI of Spain, and Princess Elizabeth of Yugoslavia.
- Father-in-law of Princess Elisabeta von Hohenzollern-Sigmaringen, daughter of King Ferdinand of Romania and Queen Marie of Romania.
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