William I, Marquis of Namur Marquis of Namur (1324–1391) Parents Marie of Artois John I, Marquis of Namur Children John III, Marquis of Namur William II, Marquis of Namur Marie de Namur Siblings Philip III, Marquis of Namur Blanche of Namur John II, Marquis of Namur Guy II, Marquis of Namur Marie of Namur Henri de Dampierre Robert of Namur Louis de Dampierre Elisabeth, Countess of Namur Partners Jeanne of Hainault Caterina di Savoia-Vaud