John I of Namur

John I of Namur (1267–1330), son of Count Guy of Flanders and Isabelle of Luxembourg, governed Namur for his father from 1297 and succeeded as marquis in 1305. He fought at the Golden Spurs victory in 1302, was defeated at Mons-en-Pévèle in 1304 and made peace with France in 1307.

In 1308 the French king ruled in his favour against Charles of Valois's claim. The emperor's 1314 grant of Cambrai led to his excommunication, and he fought Liège's bishop from 1318 to 1322. With Marie of Artois he fathered later counts and Blanche, queen of Sweden, and died in 1330.