Beatrice, Countess of Montfort

Beatrice de Montfort, Countess of Montfort-l'Amaury was a ruling sovereign countess of Montfort from 1249 until 1312. She was also countess of Dreux by marriage to Robert IV, Count of Dreux. She was the ancestor of the Dukes of Brittany from the House of Montfort-Dreux which derived its name from her title.