opposition by the people. Otto captured the twelve leaders of the rebel militia, which had deposed and imprisoned the Pope, and had them hanged. Taking up permanent residence at Rome, the Emperor travelled, accompanied by the Pope, to Ravenna to celebrate Easter in 967. A following synod confirmed Magdeburg's disputed status as a new archdiocese with equal rights to the established German archdioceses. With his matters arranged in northern Italy, the Emperor continued to expand his realm to the south. Since February 967, the Prince of Benevento, Lombard Pandolf Ironhead, had accepted Otto as his overlord and received Spoleto and Camerino as fiefdom. This decision caused conflict with the Byzantine Empire, which claimed sovereignty over the principalities of southern Italy. The eastern Empire also objected to Otto's use of the title Emperor, believing only the Byzantine Emperor Nikephoros II Phokas was the true successor of the ancient Roman Empire. The Byzantines opened peace talks with Otto, despite his expansive policy in their sphere of influence. Otto desired both an imperial princess as a bride for his son and successor Otto II as well as the legitimacy and prestige of a connection between the Ottonian dynasty in the West and the Macedonian dynasty in the East. In order to further his dynastic plans, and in preparation for his son's marriage, Otto returned to Rome in the winter of 967 where he had Otto II crowned co-Emperor by Pope John XIII on Christmas Day 967. Although Otto II was now nominal co-ruler, he exercised no real authority until the death of his father. In the following years, both empires sought to strengthen their influence in southern Italy with several campaigns. In 969, John I Tzimiskes assassinated and succeeded Byzantine Emperor Nikephoros in a military revolt. Finally recognizing Otto's imperial title, the new eastern emperor sent his niece Theophanu to Rome in 972, and she married Otto II on 14 April 972. As part of this rapprochement, the conflict over southern Italy was finally resolved: the Byzantine Empire accepted Otto's dominion over the principalities of Capua, Benevento and Salerno; in return the German Emperor retreated from the Byzantine possessions in Apulia and Calabria. Society, culture, law and science Final years and death With his son's wedding completed and peace with the Byzantine Empire concluded, Otto led the imperial family back to Germany in August 972. In the spring of 973, the Emperor visited