Margaret of Bavaria (1380-1449) was a notable figure in European history, serving as the Duchess of Bavaria and later as the Countess of Hainaut, Holland, and Zeeland. She was the daughter of Stephen III of Bavaria and Taddea Visconti, and her marriage to William VI of Holland helped strengthen political alliances in the region. Margaret played a significant role in the governance of her territories, particularly after the death of her husband. She was known for her administrative skills and efforts to maintain peace and stability in her lands during a time of political turmoil in the Low Countries.