and heiress of Renaud III, thus adding to his possessions the sizeable realm of the County of Burgundy. In an attempt to create comity, Emperor Frederick proclaimed the Peace of the Land, written between 1152 and 1157, which enacted punishments for a variety of crimes, as well as systems for adjudicating many disputes. He also declared himself the sole Augustus of the Roman world, ceasing to recognise Manuel I at Constantinople. Second, Third and Fourth Italian Campaigns: 1158–1174 The retreat of Frederick in 1155 forced Pope Adrian IV to come to terms with King William I of Sicily, granting to William I territories that Frederick viewed as his dominion. This aggrieved Frederick, and he was further displeased when Papal legates chose to interpret a letter from Adrian to Frederick in a manner that seemed to imply that the imperial crown was a gift from the Papacy and that in fact the Empire itself was a fief of the Papacy. Disgusted with the pope, and still wishing to crush the Normans in the south of Italy, in June 1158, Frederick set out upon his second Italian expedition, accompanied by Henry the Lion and his Saxon troops. This expedition resulted in the revolt and capture of Milan, the Diet of Roncaglia that saw the establishment of imperial officers and ecclesiastical reforms in the cities of northern Italy, and the beginning of the long struggle with Pope Alexander III. Milan soon rebelled again and humiliated Empress Beatrice (see Legend below). The death of Pope Adrian IV in 1159 led to the election of two rival popes, Alexander III and the antipope Victor IV, and both sought Frederick's support. Frederick, busy with the siege of Crema, appeared unsupportive of Alexander III, and after the sacking of Crema demanded that Alexander appear before the emperor at Pavia and to accept the imperial decree. Alexander refused, and Frederick recognised Victor IV as the legitimate pope in 1160. In response, Alexander III excommunicated both Frederick I and Victor IV. Frederick attempted to convoke a joint council with King Louis VII of France in 1162 to decide the issue of who should be pope. Louis neared the meeting site, but when he became aware that Frederick had stacked the votes for Alexander, Louis decided not to attend the council. As a result, the issue was not resolved at that time. The political result of the struggle with Pope