The domestic problems Otto the Great faced between 963 and 972 had not been resolved by his death. The Saxon nobility continued to resist the Archdiocese of Magdeburg located along the Empire's eastern border. Though established by Otto I, the exact details of the diocese's boundaries were left to Otto II and his aides. Otto II's marriage to the Byzantine Princess Theophanu proved to be to his disadvantage because the Saxon nobles felt it distanced the Emperor from their interests. Among Otto II's chief advisors, only the Saxon Bishop Dietrich I of Metz had close connections with the old Saxon nobility. His other advisers lacked support from the Empire's various Dukes. The Archbishop of Mainz, Willigis, appointed in 975, who had been Otto II's advisor since Otto the Great's second expedition into Italy in the 960s, had not been born into a noble family. Hildebald of Worms, who had been appointed as Otto II's Chancellor in 977 and then as Bishop of Worms in 979, was also not from a noble family.