Robert I of the Marck lord of Arenberg (1465-1541) (1465–1541) Parents Margaretha van Bouchout Burggravin van Brussel Évrard III de La Marck Children Robert II of the Marck, lord of Arenberg Siblings Eberhard IV. von der Mark-Arenberg Margarethe de La Marck-Arenberg Partners Mathilde de Rovere-Montfoort