In 1130 Prince Robert visited Rome to pay homage to Pope Honorius II and secure papal backing for the lasting occupation of Tarragona.

[2]: 70  During his absence, Robert's wife Sibyl ruled the Principality, even patrolling the walls in full knight's attire, with staff in hand, to keep the sentries alert.

[2]: 74  The agreement also attempted to curb internal dissent by clearly delineating all feudal ties within the realm, through fealty to the magistrates, and thereby to Robert, and to his lord, the archbishop.

One year later, on 9 February 1149, the Archbishop modified this charter to specifically supplant the original 1129 agreement, by removing the section of the original 1129 agreement which conceded "the city with its territory" to Robert d'Aguilo I "in perpetuity" and instead dividing Tarragona's rights and revenues into five parts, including granting one section of the city, where the Archbishop himself resided, immunity from secular judges.

The Archbishop charged the d'Aguilos and their fellow Norman settlers with several serious offenses, only one of which was needed to justify denunciation of his vassal; the d'Aguilos were blamed for burning mills operated by the Church on three occasions, destroying a canal, a sown field on ecclesiastical land, violating the immunity of the town of Constanti, alienating two honores from church possessions at San Vicente and Centcelles, and commending other property without archiepiscopal consent in violation of the 1148 revised charter.

[2]: 77 Archbishop Bernard Tort had, in the 1140s, created numerous special dominicaturae in order to ensure ample land for the future expansion of his Church throughout the Principality.

Furthermore, the Archbishop had declared his dominion over the old temple section of the city's acropolis surrounding the future site of Tarragona's cathedral, Santa Tecla la Vieja.

The purpose of Guillem's charges was to make the court recognize that this right, if used arbitrarily and without restriction, was an encroachment upon his family's estate, and constituted a violation of the covenant of 1129.

However, the archdeacon of Tarragona claimed that Guillem's charges were untrue, and after several witnesses were heard, he demonstrated that the lands had for sometime been considered part of the Church's dominicatura at Constanti.

[2]: 77 Due to Guillem's inability to provide proof of his case, either by written evidence of the sale or witnesses to counter those of the archdeacon, the contested property was awarded by the court to the church.

[4]: 434–440 In June 1153, following more litigation, Guillem and his mother, in the name of Robert d'Aguilo I, who still claimed his title of Prince, renewed their vassalage to the archbishop and, for the first time, also swore fealty to Ramon Berenguer IV, Count of Barcelona.

[4]: 457  Archbishop Cervello, who had ties to the Count of Barcelona, was deeply hostile to the d'Aguilo family, and served as their primary adversary for much of the civil war.

[4]: 467–475 Meanwhile, in June 1171, a series of papal bulls were issued by Pope Alexander III in response to the Archbishop's murder, excommunicating the d'Aguilo family from the Church and demanding their expulsion from Tarragona.

[4]: 480–487 The Principality minted its own currency, the libra, which bears the head of an Eagle on the obverse, representing the d'Aguilo family, and on the reverse the Tau or Greek cross of Santa Tecla, patron saint of the city.