John I of Montfort

John I de Montfort (c. 1228–1249) inherited the county of Montfort-l'Amaury in 1241 from his father Amaury VI de Montfort. In March 1248 he married Jeanne de Châteaudun, lady of Château-du-Loir, whose only child by him was Beatrice, later countess of Montfort.

That July he took the cross with Louis IX on the Seventh Crusade. His fleet reached Limassol only to be scattered by storms, and John died of sickness in Cyprus early in 1249.