"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.
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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)