Tags: Noble.
John I Count of Nassau-Dillenburg (German: Johann I. von Nassau-Dillenburg Dutch: Jan I van Nassau-Dillenburg; c. 1340 – 4 September 1416 Keppel) was a Count of Nassau in Siegen and Dillenburg. He was a son of Count Otto II of Nassau and Aleyda Countess of Vianden.John of Nassau married Margareta of the Marck on 30 November 1357. She was the daughter of Adolph II of the Marck and Margareta of Cleves.