 He followed Theobald I of Navarre to the Holy Land in the Barons' Crusade of 1239 and there died a year later.His widow sold her counties to the French crown.Of Jehan's poetry survive one "pastourelle", "Par desous l'ombre d'un bois", and two "chansons d'amour", "Pensis d'amours, joians et corociés" and "Je n'os chanter trop tart ne trop souvent".