Margaret III of Flanders was a noblewoman born in 1344, known for her role as the Countess of Flanders, Rethel, Nevers, and Franche-Comté. She was the daughter of Louis I, Count of Flanders and Margaret II, Countess of Flanders. Margaret married Philip the Bold, Duke of Burgundy, which strengthened the ties between the Burgundian and Flemish territories. Her marriage produced several children, including John the Fearless, who became Duke of Burgundy. Margaret's influence helped shape the political landscape of the region during the late 14th century, as her descendants played significant roles in European history.