action against the Muslims. While still in central Italy, however, Otto II suddenly died on 7 December 983, and was buried in St. Peter's Basilica in Rome. Otto III was crowned as king on Christmas Day 983, three weeks after his father's death, by Willigis, the Archbishop of Mainz, and by John X, the Archbishop of Ravenna. News of Otto II's death first reached Germany shortly after his son's coronation. The unresolved problems in southern Italy and the Slavic uprising on the Empire's eastern border made the Empire's political situation extremely unstable. With a minor on the throne, the Empire was thrown into confusion and Otto III's mother Theophanu assumed the role of regent for her young son. Child King Regency of Henry II Otto III's cousin Henry II had been deposed as Duke of Bavaria by Otto II in 976 following his failed rebellion and imprisoned within the Bishopric of Utrecht. Following Otto II's death, Henry was released from prison. As Otto III's nearest male Ottonian relative, Henry II claimed the regency over his infant cousin. Archbishop of Cologne Warin granted Henry II the regency without substantial opposition. Only Otto III's mother Theophanu objected, along with his grandmother, the Dowager Empress Adelaide of Italy, and his aunt, Abbess Matilda of Quedlinburg. Adelaide and Matilda, however, were both in Italy and unable to press their objections. As regent, Henry II took actions aimed less at guardianship of his infant cousin and more at claiming the throne for himself. According to Gerbert of Aurillac, Henry II adopted a Byzantine-style joint-kingship. Towards the end of 984, Henry II sought to form alliances between himself and other important figures in the Ottonian world, chief among them his cousin King Lothar of France. In exchange for Lothar's agreement to make Henry II king of Germany, Henry II agreed to relinquish Lotharingia to Lothar. The two agreed to join their armies on 1 February 985, in order to take the city of Breisach, but at the last minute, Henry's resolve weakened. Nevertheless, Lothair continued to campaign into German lands and succeeded in overrunning the Verdun by March 985. Henry II took the young Otto III and traveled to Saxony. There, Henry II invited all the great nobles of the kingdom to celebrate Palm Sunday at Magdeburg for 985. He then campaigned openly for his claim to the German throne, with limited success. Among those who