John I of Nassau-Siegen Count of Nassau-Siegen (1362-1416) (1339–1416) Parents Adelaide of Vianden Otto II of Nassau-Siegen Children Engelbert I of Nassau-Siegen Adolf of Nassau-Siegen John II of Nassau-Siegen Henry of Nassau-Siegen John III of Nassau-Siegen Johann III von Nassau Siblings Otto of Nassau-Siegen Henry of Nassau-Siegen Adelaide of Nassau-Siegen Partners Margareta von der Mark