sentences:  About 1410 Peter d'Ailly, Bishop of Cambrai, seems to have taken the first steps towards the suppression of the heresy.William of Hildernissen consented to a retraction, the sincerity of which appeared doubtful.In 1411, a second investigation resulted in another retraction, but also in a sentence compelling William to return permanently to an extra-diocesan Carmelite monastery after three years' detention in one of the episcopal castles.