Duke Alexander Frederick Constantin of Oldenburg was the second son of Duke Peter of Oldenburg and his wife, 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.
Alexander of Oldenburg by Hau, 1853.
Alexander Petrovich of Oldenburg and his wife Princess Eugenia Maximilianovna of Leuchtenberg.
Alexander Petrovich of Oldenburg
The Imperial Order of Saint Alexander Nevsky was an order of chivalry of the Russian Empire first awarded on 1 June [O.S. 21 May] 1725 by Empress Catherine I of Russia.
Portrait of the first Russian Minister of Finance, Alexei Vasiliyev, wearing the sash and badge of the Order of Saint Alexander Nevsky
Cross version, edition 1820–1830 (front)
version issued in 1865 in gold on black enamel