From the Chaosium website:
St. Bartholomew's Abbey and Other Excerpts for Cthulhu Dark Ages
Saint Bartholomew's Abbey is an autonomous Benedictine monastery situated along the Lot river, nestled below the Cévennes mountains within the Massif Central region of southeastern France. The year is 962 A.D., and this monastery is presented as an excellent place to begin your Cthulhu Dark Ages campaign. A second section of this monograph provides an overview of tenth-century France, intended to provide a backdrop against which to begin play. The third section presents the Order of St. Jerome. Within its ranks characters can find allies and invaluable support in their fight against darkness.