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Wilhelm I. "Georgios" Oldenburg-Greece & Olga Constantinovna Romanov-Holstein-Gottorp

Wilhelm I. "Georgios" and Olga Constantinovna were married in a religious ceremony on October 27th, 1867 in St. Peterburg. They had five sons and three daughters, named Constantine I., George, Nicholas, Andrei, Christopher, Alexandra, Maria and Olga.

Personal Details
- Wilhelm I. "Georgios" Oldenburg-Greece
  Wilhelm I. "Georgios" was born on December 24th, 1845 in Copenhagen, Denmark. He died at the age of 67 on March 18th, 1913 in Salonika. He was buried in Tatoi.
  
  Olga Constantinovna Romanov-Holstein-Gottorp
  Olga Constantinovna was born on August 22nd, 1851 in Pavlovsk. She died at the age of 74 on June 18th, 1926 in Pau, France. She was buried in November 1936 in Tatoi, Near Athens, Greece.

Children
- Constantine I. Oldenburg-Greece
  Constantine I. was born on August 2nd, 1868 in Athens, Greece. He died at the age of 54 on January 11th, 1923 in Palermo, Italy. He was buried in November 1936 in Tatoi, Near Athens, Greece.
  
  George Oldenburg-Greece
  George was born in 1869. He died at the age of 88 in 1957.
  
  Alexandra Oldenburg-Greece
  Alexandra was born in 1870. She died at the age of 21 in 1891.
  
  Nicholas Oldenburg-Greece
  Nicholas was born on January 22nd, 1872 in Athens. He died at the age of 66 on February 8th, 1938 in Athens.
  
  Maria Oldenburg-Greece
  Maria was born in 1876. She died at the age of 64 in 1940.
  
  Olga Oldenburg-Greece
  Olga was born in 1880. She died in 1880.
  
  Andrei Oldenburg-Greece
  Andrei was born in 1882. He died at the age of 62 in 1944.
  
  Christopher Oldenburg-Greece
  Christopher was born in 1888. He died at the age of 52 in 1940.