"Jean I de Montfort (?–1249, Cyprus), Count of Montfort from 1241 to 1249, son of Amaury de Montfort, comte de Montfort, and of Béatrice de Bourgogne.
In March 1248 he married Jeanne de Châteaudun, Dame of Château-du-Loir, daughter of Geoffroy VI, Viscount of Châteaudun, and of Clémence des Roches. Their only child was:
Beatrice de Montfort, Countess of Montfort-l'Amaury († 1312), who in 1260 married Robert IV (died 1282), comte de Dreux" - (en.wikipedia.org 04.01.2021)
