When friction developed, the brothers, unwilling to be a cause of dissension among Christians, decided to travel to Rome to see the Pope, and seek a solution that would avoid quarreling between missionaries in the field. In 867, Pope Nicholas I (858-867) invited the brothers to Rome. Their evangelizing mission in Moravia had by this time become the focus of a dispute with Archbishop Adalwin of Salzburg (859–873) and Bishop Ermanrich of Passau (866-874), who claimed ecclesiastical control of the same territory and wished to see it use the Latin liturgy exclusively.