John of Flanders [SEP] mother
John of Flanders
John of Flanders (c. 1250 – 14 October 1292), also known as John of Dampierre, was the third son of the Count of Flanders and Namur Guy of Dampierre from his first marriage with Matilda of Béthune, and brother of Robert of Béthune. He is not to be confused with his half brother John I, Marquis of Namur.
Having studied law at Paris, John of Flanders was Bishop of Metz in 1280–1282, then Prince-bishop of Liège in 1282–1291. He died at Anhaive
quickly apprehended that his mother did not intend to give him the government of Hainault as she had that of Flanders to her other sons. John I of Avesnes revolted against his mother and attacked his half-brother Guy of Dampierre, who had just become count of Flanders.
John I of Avesnes persuaded the German anti-king William of Holland to seize Hainault and Flemish territory within the empire. The fighting continued until the Battle of West-Capelle on 4 July 1253, when John I of Avesnes gained a brilliant victory