close advisor of Pope Callixtus II. Accompanying Callixtus throughout France, he assisted Callixtus in his initial dealings with Holy Roman Emperor Henry V. As a well-known opponent of the emperor's right to select bishops in his territories (the Investiture Controversy), Lamberto was a natural choice for papal legate. He was sent in 1119 to deal with Henry V and delegated with powers to come to an understanding concerning the right of investiture. Forceful and determined, he summoned the bishops of the Holy Roman Empire to attend an assembly at Mainz on 8 September 1122. He expected absolute obedience, so much so that it took the mediation of Archbishop Adalbert of Mainz to prevent the suspension of Saint Otto of Bamberg for non-attendance. The struggle came to a conclusion with the Concordat of Worms in 1122 and the "Pactum Calixtinum" that was almost entirely due to Lamberto's efforts was effected on 23 September 1123. Pontificate Conclave of 1124 Pressures building within the Curia, together with ongoing conflicts among the Roman nobility, would erupt after the death of Callixtus II in 1124. The pontificates of Urban II and Paschal II saw an expansion in the College of Cardinals of Italian clerics that strengthened the local Roman influence. These cardinals were reluctant to meet with the batch of cardinals recently promoted by Callixtus II, who were mainly French or Burgundian. As far as the older cardinals were concerned, these newer cardinals were dangerous innovators, and they were determined to resist their increasing influence. The northern cardinals, led by Cardinal Aymeric de Bourgogne (the Papal Chancellor), were equally determined to ensure that the elected pope would be one of their candidates. Both groups looked towards the great Roman families for support. By 1124, there were two great factions dominating local politics in Rome: the Frangipani family, which controlled the region around the fortified Colosseum and supported the northern cardinals, and the Pierleoni family, which controlled the Tiber Island and the fortress of the Theatre of Marcellus and supported the Italian cardinals. With Callixtus II's death on 13 December 1124, both families agreed that the election of the next pope should be in three days time, in accordance with the church canons. The Frangipani, led by Leo Frangipani, pushed for the delay in order that they could promote their preferred candidate, Lamberto, but the people were eager to see Saxo de Anagni, the Cardinal-Priest of