The christianization of North-Western Toul Diocese, e frontier zone between the Empire and Francia, a wooded plateau that rivers groove and old tracks cross, took place in three periods : at first, under Merovingians a lot of chuches were built. Then, under Carolingians this action was extended but not in such an important way. After the year one thousand only few churches were still created. The dedications are very diverse and show how the West had an effect upon that, more particularly Reims diocese. The laity are the main fouders of these buildings that serve their lands. The foundations are very much bound up with the roads and the rivers which are a vector of encouters and human settlements. The creation of parishes proceeded along a contrary way to the one of churches, and it's difficult to observe it in every detail. Few in number during the first period, they increased under Carolingians and multiplied after the year one tousand. The abbeys and the bishop of Toul were almost missing from thi area before the eleventh century. Then Cistercians and Premontrean institutions were settled, helped by the seigniorial families.