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In 1579 he succeeded his brother Gilles, who was killed at the Siege of Maastricht (1579), as stadtholder of Namur and Artois.
Robert III of Artois (1287–1342) was Lord of Conches-en-Ouche, of Domfront, and of Mehun-sur-Yèvre, and in 1310 he received as appanage the county of Beaumont-le-Roger in restitution for the county of Artois which he claimed.