Duke Alexander Frederick Constantin of Oldenburg was the second son of Duke Peter of Oldenburg and Princess Therese of Nassau-Weilburg. Though he had a German title and ancestry, Alexander and his siblings were born and raised in St. Petersburg as the grandchildren of Grand Duchess Catherine Pavlovna of Russia.
- Occupation
- military officer, politician
- Position held
- member of the State Council of the Russian Empire
- Citizenship
- Russian Empire
- Born
- May 21, 1844