Margareta von der Mark German countess (-1409) (d. 1409) Parents Adolph II of the Marck Margaret of Cleves, Countess of the Marck Children John III of Nassau-Siegen Henry of Nassau-Siegen Adolf of Nassau-Siegen Engelbert I of Nassau-Siegen John II of Nassau-Siegen Siblings Eberhard von der Mark Theoderic I of the Mark Engelbert III of the Mark Adolf III of the Marck Mechtild von der Mark Partners John I of Nassau-Siegen