William George I of the Hellenes Oldenburg, King of Greece (RIN: 227), son of Christian IX and Louise of Hesse-Cassel , was born 24 December 1845 in Copenhagen,Denmark. He married Olga Constantinovna , Princess 1867. He died 18 March 1913 in Salonika. Olga Constantinovna , Princess (RIN: 228), daughter of Constantine Nikolaievitch of Russia and Elizabeth Alexandra of Saxe- , was born 1851. She died 1926.
| 1. Andrew of Greece (RIN: 104), b. 1882 | See Andrew of Greece , Prince & Alice of Battenberg , Princess |
| 2. Alexandra of Greece (RIN: 163), b. 1870 | See Paul Alexandrovich Romanov, Grand Duke & Alexandra of Greece , Princess |
| 3. Nicholas of Greece (RIN: 229), b. 1872 | See Nicholas of Greece , Prince & Helen Vladimirovna of Russia Romanov, Grand Duchess |
| 4. Constantine I Oldenburg (RIN: 405), b. 02 August 1868 | See Constantine I Oldenburg, King of Greece & Sophie of Prussia , Queen of Greece |
| 5. Christopher Oldenburg (RIN: 465), b. 1888 | See Christopher Oldenburg & Anastasia Stewart OR Christopher Oldenburg & Francis of Guise |
| 6. George Oldenburg (RIN: 466), b. 1869 | See George Oldenburg & Mary |
| 7. Olga (RIN: 467) | |
| 8. Mary (RIN: 2673), b. 1876 | See George Romanov & Mary OR Perikles Joannides & Mary |
Notes for William George I of the Hellenes Oldenburg, King of Greece:
Notes for Olga Constantinovna , Princess:
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