brought on by winter and a French relief army under Hugh Capet forced Otto II and Charles to lift the siege on November 30, and to return to Germany. On the journey back to Germany, Otto's rearguard was attacked and destroyed by French forces, with their supplies being captured. Despite neither side obtaining a clear victory, Otto II felt his honor was sufficiently restored and opened peace negotiations with the French King. Peace was finally concluded between Otto II and Lothair in 980: in return for renouncing his claims on Lorraine, Otto II would recognize Lothair's son Louis V as the rightful heir to the French throne. With peace concluded, Otto II returned to Aachen to celebrate Pentecost, and then moved towards Nijmegen. During the journey, in late June or early July 980, the Empress Theophanu gave birth to the Imperial couple's only son: Otto III. Reign in Italy Papal politics With his rule north of the Alps secured and with the birth of his heir, Otto II shifted his focus to Italy. The situation south of the Alps was chaotic. Pope Benedict VI, who had been appointed by Otto I, had been imprisoned by the Romans in Castel Sant'Angelo. When Otto II sent an imperial representative, Count Sicco, to secure his release, Crescentius I and Cardinal Franco Ferrucci had Benedict VI murdered while still in prison in 974. Cardinal Franco Ferrucci then crowned himself as Benedict VI's successor, becoming Antipope Boniface VII. A popular revolt, however, forced Boniface VII to flee to Constantinople, taking a vast treasure with him. In October 974, under the direction of Count Sicco, the bishop of Sutri was elected Pope as Pope Benedict VII. Boniface VII was then summarily excommunicated for his unsuccessful attempt to take the papacy. In 979 Benedict VII's position as ruler of Rome was threatened, forcing the Pope to withdraw from and seek the aid of the Emperor. Accepting the Pope's call for aid, Otto II and Theophanu, along with their infant son Otto III, prepared for a march south across the Alps. Otto II appointed Willigis, the Archbishop of Mainz, to serve as his regent over Germany. In October 980 the Imperial court arrived in Chiavenna and received its first Italian delegations. Otto II arrived in Italy at Pavia on December 5, 980. In Pavia, Otto II and his mother, the dowager empress Adelaide of Italy, were reconciled after