Columbia subject headings:
Catholic Church--Italy--Piacenza--History--Middle Ages, 600-1500.
Council of Piacenza (1094)
Urban II, Pope, approximately 1042-1099.
Harvard subject headings:
Church history--Middle Ages, 600-1500
Council of Piacenza (1094)
Urban II, Pope, approximately 1042-1099.
Princeton subject headings:
Church history--Middle Ages, 600-1500.
Council of Piacenza (1094)
Urban II, Pope, approximately 1042-1099.