I. Bishopric

The diocese of Breslau (Wrocław) was erected in the year 1000 and made suffragan to Gnesen (Gniezno); it was identical with the Piast duchies of Silesia and long remained a missionary see. The Breslau castellan Peter Wlast (died 1153) founded a Benedictine abbey on the Elbing (Elbla̧g) River. The Sand Island was granted in 1149/1150 to Augustinian Canons from Flanders, who had reside…