Marie of Brittany, Countess of Saint-Pol

Marie of Brittany (1268–1339), also called Marie de Dreux, was the daughter of John II, Duke of Brittany, and Beatrice of England, and a granddaughter of King Henry III. In 1292 she married Guy IV of Châtillon, Count of Saint-Pol.

Her son John succeeded as Count of Saint-Pol; her daughter Mahaut married Charles of Valois; and another daughter, Marie, Countess of Pembroke, founded Pembroke College, Cambridge. Marie died in May 1339.