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Marie d’Harcourt, or Mary of Guelders as she is perhaps better known, was Duchess of Guelders as the wife of Reinald IV, Duke of Guelders and Jülich. They had no children and Marie was widowed in 1423 when her husband died while en route to Castle Rosendael. She remarried in 1426 to Rupert of Jülich-Berg, who was 20 [read more]