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... Wikipedia
Born: France
Died: March 9, 1312
Parents: John I of Montfort and Jeanne, Dame de Chateaudun
Children: Yolande of Dreux, Queen of Scotland and John II, Count of Dreux
Great-grandparents: Simon de Montfort, 5th Earl of Leicester, Alix de Montmorency, Alice de Freteval, and more
Great grandchildren: John IV, Duke of Brittany, Joan of Brittany, Baroness of Drayton, Jeanne de Pierrepont, dame de Blazan, and more
Grandchildren: John of Montfort, Joan II, Countess of Dreux, Robert V, Count of Dreux, and more