The early Salians owed much of their success to their alliance with the Church, a policy begun by Otto I, which gave them the material support they needed to subdue rebellious dukes. In time, however, the Church came to regret this close relationship. The alliance broke down in 1075 during what came to be known as the Investiture Controversy (or "Investiture Dispute"), a struggle in which the reformist Pope, Gregory VII, demanded that Emperor Henry IV renounce his rights over the Church in Germany. The pope also attacked the concept of monarchy by divine right and gained the support of significant elements of the German nobility interested in limiting imperial absolutism. More important, the pope forbade ecclesiastical officials under pain of excommunication to support Henry as they had so freely done in the past. In the end, Henry IV journeyed to Canossa in northern Italy in 1077 to do penance and to receive absolution from the pope. However, he resumed the practice of lay investiture (appointment of religious officials by civil authorities) and arranged the election of an antipope (Antipope Clement III) in 1080.