In 1025, a Catholic council was held at Arras against certain Manichaean (dualistic) heretics who rejected the sacraments of the Church. In 1093, the bishopric of Arras was refounded on territory split from the Diocese of Cambrai. In 1097 two councils, presided over by Lambert d'Arras, dealt with questions concerning monasteries and persons consecrated to God. In this time, Arras became an important cultural center, especially for the group of poets who came to be known as trouvères. One particular society of such poets was later called the "Puy d'Arras".