At Charles the Great's deposition, the regnum Italiae, whose capital was Pavia, included north Italy from Piedmont to Friuli, Emilia as far as Modena, Tuscany, the Marches and the Abruzzi. The tumultuous immediate post-Carolingian period was dominated by the rivalry between Berengar and Wido, who were both typical products of a political transformation which had its roots in the hierarchical social order of the Frankish empire. Otto's reign immediately distinguished itself by the interest shown in Rome and in central and south Italy. In 967, Otto I raised his son to the position of co-emperor and began negotiations to obtain the hand of the Byzantine princess Theophanu for him. Despite the dealings between the two courts, there remained a certain amount of tension between them because of the renewed royal and imperial interest shown by Otto I in south Italy. The regional power structure in Italy just before the millennium shows the balance achieved between stability and innovation.