1145, Geoffroy II de Lèves, Bishop of Chartres, excommunicated Geoffrey. On his deathbed, Geoffrey became a monk at Tiron Sainte-Trinité (see Tironensian Order), making peace with the abbey and therefore the bishop. Geoffrey was succeeded as Viscount of Châteaudun by his son Hugues upon his death. Sources Settipani, Christian, Les vicomtes de Châteaudun et leurs alliés, dans Onomastique et Parenté dans l'Occident médiéval, Oxford, Linacre, Unit for Prosopographical Research, 2000 Association of Friends of the Perche, Chapelle Saint-Santin, Cahiers Percherons, No. 52, Belleme II, 1976 Europäische Stammtafeln, Vol. III, Les Vicomtes de Châteaudun Medieval Lands Project, Vicomtes de Châteaudun Commanderie d’Arville 1145 deaths Year of birth unknown Viscounts of Châteaudun