opposition was led by Archbishop Guy, who had attended the Lateran Synod of 1112. On his return to France, he immediately convened an assembly of French and Burgundian bishops at Vienne, where the imperial claim to a traditional lay investiture of the clergy was denounced as heretical and a sentence of excommunication was now pronounced against Henry V on the grounds that he had extorted the Privilegium from Paschal II by means of violence. The council called Pope Paschal a simpleton (quod rex extorsit a vestra simplicitate). These decrees were sent to Paschal II with a request for a confirmation, which they received on 20 October 1112. Papacy Paschal does not seem to have been quite pleased with Guy's zeal in his attacks upon Henry V. During the violent confrontations between Henry V and Paschal II's successor, Pope Gelasius II, the pope was forced to flee from Rome, first to Gaeta, where he was crowned, then to the Cluny Abbey, where he died on 29 January 1119. Guy was elected at Cluny on 2 February 1119. Nine cardinals took part in the election. Most of the other cardinals were in Rome. He was crowned at Vienne on 9 February 1119 as Calixtus II. At the outset, it appeared that the new pope was willing to negotiate with Henry V, who received the papal embassy at Strasbourg, and withdrew his support from the antipope he had proclaimed at Rome. It was agreed that pope and emperor should meet at the Château de Mousson, near Rheims, and in October the new Pope opened the council at Rheims attended by Louis VI of France with most of the barons of France and more than four hundred bishops and abbots. Henry V arrived for his personal conference at Mousson — not alone, as had been anticipated, but with an army of over thirty thousand men. Calixtus II, fearing that force was likely to be used to extract prejudicial concessions, remained at Rheims. There, Calixtus II busied himself ineffectively with attempting a reconciliation between the brothers Henry I of England and Robert II of Normandy, and the council dealt with disciplinary regulations and decrees against lay investiture, simony, and clerical concubines. Since there was no compromise coming from Henry V, it was determined on 30 October 1119 that the Emperor and his antipope should be solemnly excommunicated. Returning to Italy, where antipope Gregory VIII was