 Gilbert's twelve-year episcopate left a few notices of his activity.He confirmed to Dryburgh Abbey the gift of the church of Sorbie granted by his predecessor Walter, amalgamating the two churches of Sobrie Minor and Sorbie Maior, and granting to that abbey the church of Borgue with provision for a vicar set aside.He was also active in England, particular in the Bishopric of Durham during vacancies in that bishopric, when Gilbert could perform episcopal functions there like granting indulgences and dedicating altars.