She is married to John van Montfort.
They got married
Child(ren):
Joanna of Flanders (c. 1295 – September 1374) was Duchess of Brittany by her marriage to John of Montfort. Much of her life was taken up in defence of the rights of her husband and, later, son to the dukedom, which was challenged by the House of Blois during the War of the Breton Succession. Known for her fiery personality, Joanna led the Montfortist cause after her husband had been captured, and began the fight-back, showing considerable skill as a military leader.
Shortly after taking refuge in England, she was confined to Tickhill Castle by order of King Edward III.
Joanna was highly praised by the chronicler Jean Froissart for her courage and energy. Because of her feats of leadership, David Hume described her as "the most extraordinary woman of the age".
Joanna was the daughter of Louis I, Count of Nevers and Joan, Countess of Rethel, and the sister of Louis I, Count of Flanders. She married John of Monfort in March 1329. John of Monfort claimed the title of Duke of Brittany, although his claim was contested by Joan of Penthièvre and her husband, Charles of Blois. Joanna and John had two children:[1]
John IV, Duke of Brittany (1339–1399)
Joan of Brittany, Baroness of Drayton (1341 – aft. 20 October 1399), born at the onset of the War of the Breton Succession, married before 21 October 1385 to Ralph Basset, 4th Baron Basset de Drayton
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