On 12 February the ceremony took place at St. Peter's Basilica, and during the welcome at the door, the pope read out a decree, in which he repudiated lay investiture, and ordered all bishops to surrender their imperial fiefs to the emperor immediately and permanently.
XII Apostoli, were held captive for sixty-one days, while Henry pressed the pope to agree to his solution to the investiture controversy.
[4] On 18 April, at Ponte Mammolo on the Anio River, Gregory was one of the cardinals who were compelled to sign the papal promise to observe the agreement which Henry had drawn up.
[5] In 1111, Pope Paschal delegated Cardinal Gregory to hold a synod in Veroli, to complete business which had begun in the papal court, concerning the crimes of the Archdeacon Grimaldi.
Paschal retreated from the scorn and the disdain to Terracina, where he was confronted on 5 July by the cardinals, led by Giovanni of Tusculum and Leo of Ostia.
The leaders in the movement, who presented the documentary evidence to the Lateran synod, were: the papal legate in Aquitaine, Archbishop Gerard of Angoulême; the bishops Leo of Ostia and Galo of St. Pol-de-Leon; and the cardinals Robert of S. Eusebio and Gregory of SS.
In 1112 Paschal deposed him from his title because he had severely criticised (together with cardinal Robert of Sant'Eusebio, also subsequently deposed) Paschal's policy towards the emperor Henry V.[10] In February 1119, shortly after the election of Calixtus II was announced in Rome, he and Cardinal Robert, along with numerous other schismatics, wrote to the new pope, congratulating that his election was neither simoniac nor motivated by "the tumour of ambition", and begging his pardon and absolution.
They may also have known of Archbishop Guy's synod, held in October 1112, in which the council called Pope Paschal a simpleton (quod rex extorsit a vestra simplicitate) and excommunicated Henry V.[12] Calixtus restored Gregory to his cardinalate, though his earliest subscription of a papal document is dated 6 April 1123; his signature in second place seems to indicate that he was restored without loss of seniority.
XII Apostolorum to Montecassino, with orders to sort out the situation and have elected the pope's candidate, Senioretto, the Provost of the monastery at Capua.
After the surrender of Oderisio to the pope and the expulsion of Nicola for depleting the church treasury, a proper canonical election, achieved by papal intrusion, finally took place in July 1127.