Duke Peter Alexandrovich of Oldenburg
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Duke Peter Alexandrovich of Oldenburg was the first husband of Grand Duchess Olga Alexandrovna of Russia, the youngest sister of Tsar Nicholas II. Wikipedia
Born: November 21, 1868, Saint Petersburg, Russia
Died: March 11, 1924 (age 55 years), Antibes, France
Spouse: Olga Vladimirovna Ratkova-Rognova (m. 1922) and Grand Duchess Olga Alexandrovna of Russia (m. 1901–1916)
Great-grandparents: Nicholas I of Russia, Duke George of Oldenburg, Catherine Pavlovna of Russia, and more