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How did Charlemagne increase Cologne’s religious importance?

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Cologne The Hohenzollern rail and pedestrian bridge over the Rhine River, Cologne, Germany, with the city's cathedral in the background.

Charlemagne increased the religious importance of Cologne in the late 8th century by elevating the city to an archbishopric.1

This action was part of his broader religious policy, which sought to strengthen the church's hierarchical structure and deepen the spiritual life of his subjects. By establishing Cologne as an archbishopric, he solidified its status as a central ecclesiastical authority within his realm. This move aligned with his efforts to standardize church administration and ensure that his religious reforms—which included improving the quality of the clergy and intensifying pastoral care—were effectively enforced throughout the empire.21