Margaret of Brabant was a countess consort of Flanders. She was the second daughter of Duke John III of Brabant and Mary of vreux. She was the only child of Duke John to have children. In 1347 she married Louis II of Flanders, who was then sixteen years old and already count of Flanders. OnApril 1350 their daughter, Margaret III, Countess of Flanders, was baptized. Through this daughter, their only surviving child, Brabant came under the influence of Burgundy when she married Philip the Bold.
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Source: Wikipedia