Keywords: Duke Constantine Petrovich of Oldenburg in 1890.jpg Duke Constantine Petrovich of Oldenburg photographed in 1890 1890-09-21 Georgian Wikipedia W Wysocki A Kieff Photographe de la Cour/Photographer of the Court Custom license marker 2013 06 23 PD-old-100 Uploaded with UploadWizard Duke Constantine Petrovich of Oldenburg Dukes of Oldenburg Nobility of Georgia |