bull at S. Germano on 20 May 1052, and on 1 July he was in Benevento. He attended Leo in his trip to Germany, where the pope met with Emperor Henry III, and attempted to reconcile him with King Andrew I of Hungary; they were at Bamberg with the emperor, on 18 October, when Frederick signed a bull, and spent Christmas in Worms. During their return journey, Bishop Peter of Le Puy was consecrated at Ravenna on 14 March 1053, and Chancellor Frederick signed the certificate of consecration. The return from Germany had a purpose behind it. Along with Frederick came his brother Godefroy, and numerous troops. Pope Leo, who had negotiated an agreement with the Byzantine catepan of Italy, Argyros, was planning a war against the Normans, which was launched in April 1053. Argyrus proved to be no help at all. The papal forces, filled with Germans, suffered a disastrous defeat at Civitate in the Capitanata on 18 June 1053. The pope and his cardinals were driven out of their refuge in Civitate, and forced to sue for peace. They were seized by the Normans and conveyed to Benevento, where he was installed by 23 June. The pope remained in custody all winter, not setting out for Rome until 12 March 1054. Frederick was with Leo throughout the campaign against the Normans until he was appointed to the embassy to Constantinople. On 28 May 1053, he was at the monastery of Montecassino, on 10 June at Sale, and on 18 June at Civitate. In January 1054, the chancellor Frederick was appointed, along with Cardinal Humbert of Silva Candida and Archbishop Pietro of Amalfi, to a legation from Pope Leo IX to the Emperor Constantine Monomachos. Their purpose was to persuade the emperor to come to the aid of the pope, join forces with Henry III, and destroy the Normans. When the legates reached Constantinople, they were hospitably received by the emperor and stayed at the imperial palace for some time. Negotiations between them, Patriarch Michael Cerularius of Constantinople, and Archbishop Leo of Ohrid, however, did not succeed. Pope Leo died during the negotiations, on 19 April 1054. On 16 July 1054, Cardinal Humbert placed the bull of excommunication of the patriarch and archbishop on the high altar of Hagia Sophia. Cardinal Frederick discharged the function of one of the three papal legates participating in the events that led to