Duke Alexander Petrovich of Oldenburg Russian royalty (1844–1932) (1844–1932) Parents Princess Therese of Nassau Duke Peter of Oldenburg Children Duke Peter Alexandrovich of Oldenburg Siblings Duke Constantine Petrovich of Oldenburg Ekaterina Petrovna of Oldenburg Duchess Therese Petrovna of Oldenburg Duchess Alexandra of Oldenburg Georg Friedrich Alexander von Holstein-Gottorp, Herzog von Oldenburg Duke Nikolaus of Oldenburg Marie Friederike Cäcilie of Oldenburg Partners Princess Eugenia Maximilianovna of Leuchtenberg
