Finally recognizing Otto's imperial title, the new eastern emperor John I Tzimisces 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.