The modern city of Meissen owes its origin to a castle built by King Henry I the Fowler about 928 to protect German colonists among the pagan Wends. To insure the success of the Christian missions, Otto I suggested at the Roman Synod of 962 the creation of an archiepiscopal see at Magdeburg. Pope John XII consented, and shortly before the execution of the plan in 968 it was decided at the Synod of Ravenna (967) to create three bishoprics — Meissen, Merseburg, and Zeitz — as suffragans of the Archbishopric of Magdeburg. The year in which the Diocese of Meissen was established is disputed, as the oldest extant records may be forgeries; however, the record of endowment by Otto I in 971 is genuine.