During his whole pontificate he was allegedly subordinate to the head of the Crescentii clan who controlled Rome, the patricius (an aristocratic military leader) John Crescentius III.
As Pope, John XVIII occupied his time mainly with details of ecclesiastical administration. He authorized a new Diocese of Bamberg to serve as a base for missionary activity among the Slavs, a concern of Henry II's. He also adjudicated a squabble between the abbot of Fleury and the bishops of Sens and Orléans.[1]
Ultimately he abdicated and, according to one catalog of Popes, retired to a monastery, where he died shortly afterwards. His successor was Pope Sergius IV.
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