John IV, Count of Nassau-Siegen

Count John IV of Nassau-Siegen, German: Johann IV. Graf von Nassau-Siegen, official titles: Graf zu Nassau, Vianden und Diez, Herr zu Breda, was since 1442 Count of Nassau-Siegen, of Vianden and of half Diez, and Lord of Breda and of the Lek. He descended from the Ottonian Line of the House of Nassau.