[2] Alberic was successful in his endeavours to end the war for possession of the throne between the usurper Stephen of Blois and David I of Scotland,[3] who had espoused the cause of Empress Matilda, and permanent peace was ratified the next year in the Second Treaty of Durham on 9 April 1139.
Bari was in revolt against Roger II of Sicily, and Alberic intended to exhort them to acknowledge him as their lawful sovereign.
In 1139, Alberic was appointed by Innocent II to examine into the conduct of Ralph of Domfront, Latin Patriarch of Antioch and establish deeper ties with the Armenian Church.
[10] Gregory III, who was also at the synod, discussed dogma, professed a number of orthodox beliefs and promised to restore his church to union with Rome.
[12] In 1145, Alberic travelled together with Hugh of Amiens, bishop of Rouen, to Nantes to preach against heresy and witness the translation of the relics of the early Christian martyrs Donatian and Rogatian.
Upon Alberic's urging, Hugh wrote a treatise known as Contra haereticos sui temporis or De ecclesia et eius ministris libri tres that defended elaborately orthodoxy.
[13] That same year, Alberic commissioned Bernard of Clairvaux to travel throughout southwest France to preach against the teachings of Peter de Bruis and Henry of Lausanne.
[14] Alberic returned to the papal court at Viterbo by mid-November 1145, just before the issue of Quantum praedecessores, and accompanied the pope during the preparation of the Second Crusade.