Official media for the *Princess Knight* series—encompassing manga, television anime, films, and spin-offs—contains no concrete or direct references to a character named "Duc de Linoleum." Available sources extensively document figures like Duke Duralumin (alternately spelled Duralumon or Duralmon), Baron Nylon, Sapphire, Franz, Tink, and others, but the name "Duc de Linoleum" appears in none of these materials.