Joanna of Flanders was a noblewoman born in 1326, known for her role in the political landscape of medieval Europe. She was the daughter of Count Guy of Flanders and Countess Isabella of Portugal. Joanna became the Duchess of Brabant through her marriage to Duke John III, strengthening ties between Flanders and Brabant. Joanna was also involved in the Hundred Years' War, as her family had connections to both the English and French crowns. Her life was marked by the complexities of feudal alliances and territorial disputes, reflecting the turbulent nature of 14th-century European politics.