page_title: Duke Constantine Petrovich of Oldenburg
section_title: Brothers and Sisters
hierarchical_section_title: Duke Constantine Petrovich of Oldenburg / Brothers and Sisters
caption_attribution_description: English: Grand duke Nicholas Nicholaievich of Russia his wife Alexandra and their two children
context_page_description: Duke Constantine Frederick Peter of Oldenburg was a son of Duke Peter Georgievich of Oldenburg and his wife Princess Therese of Nassau-Weilburg Known in the court of Tsar Nicholas II as Prince Constantine Petrovich Oldenburgsky, he was the father of the Russian Counts and Countesses von Zarnekau.
context_section_description: The duke had 7 sisters and brothers. His sister Alexandra married into the House of Romanov while two other siblings married into the Beauharnais House of Leuchtenberg, who were considered part of the Imperial family.
  Duchess Alexandra Petrovna of Oldenburg (2 June 1838, St. Petersburg – 13 April 1900 Kiev, Ukraine); m. 1856 to Grand Duke Nicholas Nikolaevich of Russia (1831–1891), the son of Tsar Nicholas I and commander-in-chief of the Russian Armies of the Danube in the Russo-Turkish War, 1877-1878. Their son, Grand Duke Nicholas Nikolaevich of Russia (1856 - 1929) also served briefly as commander-in-chief of the Russian Army during the first year of World War I.
  Nicholas Friedrich August of Oldenburg (9 May 1840, St. Petersburg – 20 January 1886, Geneva, Switzerland); m. Maria Bulazel created Countess von Osternburg.
  Cecile of Oldenburg (27 February 1842 St. Petersburg – 11 January 1843, St. Petersburg)
  Duke Alexander Petrovich of Oldenburg (2 June 1844, St Petersburg, – 6 September 1932, Biarritz, France). Heir of the Russian Oldenburgs. He was once a candidate to the Bulgarian throne. He married in 1868 to Princess Eugenia Maximilianovna of Leuchtenberg. Their only son, Duke Peter Alexandrovich of Oldenburg, married the sister of Tsar Nicholas II, Grand Duchess Olga Alexandrovna of Russia.
  Katherine of Oldenburg (21 September 1846, St. Petersburg – 23 June 1866, St. Petersburg)
  George of Oldenburg (17 April 1848, St. Petersburg – 17 March 1871, St. Petersburg)
  Duchess Therese of Oldenburg (30 March 1852, St. Petersburg – 18 April 1883 St. Petersburg); m. George Maximilianovich, 6th Duke of Leuchtenberg (1852–1912)
caption: Grand Duchess Alexandra Petrovna of Oldenburg with her husband, Grand Duke Nicholas Nikolaevich Romanov and their two sons
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