[1] He was the second[citation needed] son of John I, Marquis of Namur,[2] and Mary of Artois.
He participated in 1332 on the side of the Count of Flanders against the Duke of Brabant, in the war over Mechelen.
[citation needed] He succeeded his brother John II as Count of Namur[2] on 2 April 1335.
Under influence of his younger brother Robert of Namur, he recognized King Edward III of England as his Lord, in exchange for a pension.
He also participated in the War against Scotland with 300 men, but was surprised by a larger Scottish force under John Randolph, 3rd Earl of Moray in the Battle of Boroughmuir.