Mechtild von der Mark (1340-1410) (1340–1410) Parents Margaret of Cleves, Countess of the Marck Adolph II of the Marck Children Maria von Isenburg Siblings Eberhard von der Mark Theoderic I of the Mark Engelbert III of the Mark Adolf III of the Marck Margareta von der Mark Partners Eberhard von Isenburg-Grenzau