San Stefano in Celiomonte elected as the next pope. Leo, eager to ensure a valid election, approached key members of every Cardinal's entourage, promising each one that he would support their master when the voting for the election was underway. On 16 December, all the Cardinals, including Lamberto, assembled in the chapel of the monastery of St. Pancratius attached to the south of the Lateran basilica. There, at the suggestion of Jonathas, the cardinal-deacon of Santi Cosma e Damiano, who was a partisan of the Pierleoni family, the Cardinals unanimously elected as Pope the Cardinal-Priest of Sant'Anastasia, Theobaldo Boccapecci, who took the name Celestine II. He had only just put on the red mantle and the Te Deum was being sung when an armed party of Frangipani supporters (in a move pre-arranged with Cardinal Aymeric) burst in, attacked the newly enthroned Celestine, who was wounded, and acclaimed Lamberto as Pope. Since Celestine had not been formally consecrated pope, the wounded candidate declared himself willing to resign, but the Pierleoni family and their supporters refused to accept Lamberto, who in the confusion had been proclaimed Pope under the name Honorius II. Rome descended into factional infighting, while Cardinal Aymeric and Leo Frangipani attempted to win over the resistance of Urban, the City Prefect, and the Pierleoni family with bribes and extravagant promises. Eventually, Celestine's supporters abandoned him, leaving Honorius the only contender for the papal throne. Honorius, unwilling to accept the throne in such a manner, resigned his position before all of the assembled Cardinals, but was immediately and unanimously re-elected and consecrated on 21 December 1124. Papacy Relations with the Holy Roman Empire Honorius immediately came into conflict with Emperor Henry V over imperial claims in Italy. In 1116, Henry had crossed the Alps to lay claim to the Italian territories of Matilda of Tuscany, which she had supposedly left to the papacy on her death. Henry had immediately begun appointing imperial vicars throughout the newly acquired province over the objections of both the Tuscan cities and the papacy. To maintain papal claims to Tuscany, Honorius appointed Albert, a papal marquis, to rule in the pope's name in opposition to the imperial Margrave of Tuscany, Conrad von Scheiern. In addition, Henry V made very little effort to implement the terms of the Concordant of Worms, to Honorius II's irritation. Local churches were forced to appeal to Rome to obtain restitution