Otto III made Rome the administrative capital of his Empire and revived elaborate Roman customs and Byzantine court ceremonies. During his time in Italy, the Emperor and the Pope attempted to reform the Church, and confiscated church property was returned to the respective religious institutions. Additionally, after the death of the Bishop of Halberstadt in November 996, who had been one of the masterminds behind the abolition of the bishopric of Merseburg, Otto III and Pope Gregory V began the process of reviving the Diocese. Otto I had established the Diocese in 968 following his victory over the Hungarians in order to Christianize the Polabian Slavs but it had been effectively destroyed in 983 with the Great Slav Rising following the death of Otto II that year.