Dietrich of the Mark Lord of Dinslaken and administrator of the Prince-Bishopric of Osnabrück (1336-1406) (1336–1406) Parents Margaret of Cleves, Countess of the Marck Adolph II of the Marck Children Siblings Adolf III of the Marck Engelbert III of the Mark Eberhard von der Mark Mechtild von der Mark Margareta von der Mark