John III, Count of Nassau-Siegen

Count John III the Younger of Nassau-Siegen, German: Johann III. der Jüngere Graf von Nassau-Siegen, succeeded, with his brothers, his father in 1416 as Count of Nassau-Siegen. With his brothers, he inherited the County of Vianden in 1417, and also inherited half of the County of Diez in 1420. He descended from the Ottonian Line of the House of Nassau.