He was one of the first nominees when the category for Best Costume Design was introduced at the Academy Awards in 1948 for his work on The Emperor Waltz.
Emperor | Holy Roman Emperor | Wilhelm II, German Emperor | Joseph II, Holy Roman Emperor | Maximilian I, Holy Roman Emperor | Roman Emperor | Frederick II, Holy Roman Emperor | Emperor of Japan | emperor | Roman emperor | Frederick I, Holy Roman Emperor | Charles VI, Holy Roman Emperor | Francis II, Holy Roman Emperor | Ferdinand I, Holy Roman Emperor | Charles IV, Holy Roman Emperor | William I, German Emperor | Hongwu Emperor | Sigismund, Holy Roman Emperor | Godspeed You! Black Emperor | Yellow Emperor | Otto I, Holy Roman Emperor | Henry II, Holy Roman Emperor | German Emperor | Frederick III, German Emperor | Emperor Meiji | Frederick III, Holy Roman Emperor | Francis I, Holy Roman Emperor | Emperor Wu | Emperor Taizong of Tang | Emperor of Ethiopia |
Ruman continued his trend of playing over-the-top German characters later in his career for Lubitsch's protege Billy Wilder, appearing in Wilder's films The Emperor Waltz, Stalag 17 and The Fortune Cookie.