Background
He was the second son of John I, Marquis of Namur, and Mary of Artois.
He was the second son of John I, Marquis of Namur, and Mary of Artois.
He participated in 1332 on the side of the Count of Flandres against the Duke of Brabant, in the war over Mechelen. 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. Guy was taken prisoner, but released for ransom.
After his return to Namur, he participated in a tournament in Flanders, where he was mortally wounded.
