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In page Battle of Civitate:
"After six more years, and three more anti-Norman popes, the Treaty of Melfi (1059) marked the recognition of the Norman power in South Italy. There were two reasons for this change in papal politics. First, the Normans had shown themselves to be a powerful (and nearby) enemy, whereas the emperor was a weak (and far off) ally. Second, Pope Nicholas II had decided to cut the bonds between the Roman Church and the Holy Roman emperors, reclaiming for the Roman cardinals the right to elect the pope (see Investiture Controversy), thus reducing the importance of the emperor. And in the foreseeable struggle against the Empire, a strong ally was more desirable than a strong enemy.[citation needed]
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