Today's area of Zenica had its peak in the first six centuries of the new era, when in the parts of nowadays Zenica – aside from Bistua Vetus (Barbarians' village in Rama) and Delminium (Duvanjsko Field) – one of the three most important municipiums and centers of Christian dioceses in Bosnia has been found: Bistua Nuova – seat of the Bistuenska diocese, seat of the Roman Christianity in the Bosnia area all time until the Slavs' arrival.