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Hilduin was elected but not confirmed as Bishop of Cologne. He was director of the Carolingian court chapel and abbot of St. Denis near Paris. The decline of the greater Franconian empire began during his time. The part of the Cologne Diocese on the right bank of the Rhine was in the eastern Franconian kingdom, while the section on the left bank belonged to the middle kingdom of Kaiser Lothar I. The conflicting loyalties arising from this situation led to a crisis under Hilduin's successor Gunthar.