Marie of Blois was a French noblewoman born around 1344. She was the daughter of Charles of France and Marie of France, and she became the Countess of Blois through her marriage to Guy of Châtillon. Marie played a significant role in the political landscape of her time, particularly during the Hundred Years' War. Marie was known for her strong leadership and involvement in regional affairs. After her husband's death, she took control of the county and defended it against various threats. Her efforts helped maintain the stability of Blois during a tumultuous period in French history.