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In page Ravenna:

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After Pepin’s Donation and the establishment of the Papal States, Byzantine-era administrative structures collapsed during the 9th and 10th Centuries. Papal control was indirect, with local dukes and Lombard lords exercising de facto power.[citation needed] During the 11th and 12th Centuries, Ravenna became a contested city between the Holy Roman Empire and the Papacy, with imperial appointees often clashing with papal legates.[citation needed]