3732. Alphonse de Brienne Comte d’Eu. Alphonse died on 13 Sep 1270 in Carthage. He died of the plague. Buried on 22 May 1271 in St. Martin Chapel, St.Denis Abbey.
In 1251 Jean second married Jeanne de Châteaudun Dame de Château-du-Loir, daughter of Vicomte Geoffrey de Châteaudun (-1249) & Clemence des Roches. Born in 1227.