The Emperor, armed with this support, requested Paul to recall the Council from Bologna to Trent. He expressly stated that he did not approve of all that had been said against the papal authority, but urged the Pope to take advantage of this unlooked-for submission on the part of Germany. It cannot be denied that a serious question of principle was involved in this request. Although the Emperor did not definitely claim the right of presidency, yet the demand that the Council should return to Trent, where still some of the Spanish and Neapolitan bishops remained, practically assumed that the Council at Bologna was no true Council. Compliance with the demand of Charles would have emphasised the control of the temporal over the spiritual power, and dealt a blow at the independence of the Church, which claimed to be guided by the Holy Spirit. And yet if the Pope had really been in complete harmony with the Emperor on other matters, one of the many compromises which were suggested could probably have been carried out by the clever diplomacy of Mendoza, the imperial ambassador at Rome. Unfortunately, the affairs of Italy once more stood in the way of that reconciliation between Pope and Emperor which was so desirable for the welfare of the Church. On September 10 Pierluigi Farnese, to whom his father Paul had granted Parma and Piacenza, fell a victim to a conspiracy. He had been the centre of anti-imperialist intrigues during the winter and spring of 1546-1547; and Gonzaga, the imperial governor at Milan, who, with the consent of the Emperor, had supported the conspiracy though not the assassination, forthwith occupied Piacenza, ostensibly to preserve the peace, but really in pursuit of ambitious views of extending the imperial authority in north Italy. The angry Pope at once entered into negotiations with Henry II. of France. He was even heard to say that he would call hell itself to avenge him of his enemy. At the same time the prelates at Bologna, influenced, it must be allowed, by more worthy motives, replied to the Emperor’s demand by summoning those ecclesiastics who had remained at Trent to join them at Bologna, whereby they might show that Germany meant to obey the Council. Charles might now have attempted to form a Council of his own at Trent; but he was too good a Catholic to think of starting a schism. Declaring therefore that he must take measures for the protection of that Church which the Pope neglected, he determined to settle matters in his own way. His confessor, Pedro de Soto, suggested that he should forbid all Lutheran preaching, insist on the restoration of secularised property, and of the Catholic ritual, and then leave every one to think as he pleased. But this, said Ferdinand, would require another war. The Emperor therefore fell back on the suggestion of his brother, that he should try to find some ground of union in Germany independently of the Pope. The Interim followed,