Beatrice, Countess of Montfort

Beatrice de Montfort (c. 1248–1311) inherited the county of Montfort-l'Amaury as an infant in 1249, when her father John I died in Cyprus on the Seventh Crusade. In 1260 she married Robert IV, Count of Dreux, who became count of Montfort by right of his wife and ruled alongside her.

Her daughter Yolande married King Alexander III of Scotland and later Arthur II, Duke of Brittany; through Yolande she was ancestress of the Montfort dukes of Brittany. Her son John II became Count of Dreux, and Beatrice died on 9 March 1311.