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Daughter of Robert II de Commercy, comte de Roucy and Marie d'Amboise Chaumont Wife of Robert III de la Marck Arenberg Sedan, Burggraf von Bouillon Mother of Duke Robert IV of the Mark, Hertog van Bouillon Sister of Philippe De Silly; Aimee van Saarbrucken Commercy and Catherine de Sarrebruck, comtesse de Roucy