reign, Otto II established at least four monasteries: Memleben, Tegernsee, Bergen, and Arneburg. Monasticism became a key part of Otto II's Imperial policy, entrusting the abbots with key political functions. Otto II employed monks among his top political advisers, including Ekkehard I and Majolus of Cluny. One of the most important such monks was John Philagathus (the future Antipope John XVI). Of Greek descent, John was the personal chaplain of Otto II's wife Theophanu, accompanying her when she traveled from Constantinople to marry Otto II. Otto II appointed him as his Imperial Chancellor from 980 to 982, as well as abbot of Nonantola Abbey. Following Otto II's death in 983, Theophanu, as her son Otto III's regent, would name John as Otto III's tutor. She would later appoint John as the bishop of Piacenza, and would send him to Constantinople to arrange for a marriage between Otto III and a Byzantine princess. Southern expansion In regard to his Italian policy, Otto II went beyond the goals of his father. Not satisfied with the territorial gains made under Otto I, Otto II's policy was based not only on securing his power in Rome and cooperating with the Papacy, but also on gaining absolute dominion over the whole of Italy. Influenced by his wife, who was hostile to the return of the Macedonian Dynasty in the shape of Byzantine Emperor Basil II after the assassination of John I Tzimisces, Otto II was persuaded to annex Byzantine-controlled southern Italy. However, this policy necessarily meant war not only with the Byzantine Empire but with the Muslim Fatimid Caliphate, which claimed southern Italy as within its sphere of influence. The Ottonians' chief lieutenant in central and southern Italy had long been the Lombard leader Pandulf Ironhead. Originally appointed by Otto I as Prince of Benevento and Capua in 961, Pandulf waged war against the Byzantines and expanded Ottonian control to include the Duchy of Spoleto in 967. The following year, under Otto II, Pandulf added the Principality of Salerno to the Empire. His campaigns under Otto I and Otto II incorporated all three of the southern Lombard principalities - Benevento, Capua, and Salerno - into the Holy Roman Empire. As vassal of Otto II, Pandulf ruled a large bloc of territories stretching as far north as Tuscany and as far south as the Gulf of Taranto. Pandulf's death in 981 deprived Otto II of one