it is probable that jerome was appointed bishop by raymond, who was in charge of reestablishing ecclesiastical structures in the recently conquered territory between the duero and the sierra de guadarrama. jerome does not seem to have personally resided at salamanca, which was practically a frontier post in those days. instead, he lived mainly at zamora. he also supervised ecclesiastical life in the region of ávila, where a document of 1103 in which some men of ávila made a donation to the castilian monastery of san millán de cogolla, even refers to him as "bishop of ávila" ("episcopus abelensis"). documents of 1104, 1107 and 1111 call him bishop of zamora. there he had replaced another cleric, roscelin, probably also a frenchman, who was entrusted by raymond with the two zamoran churches at an earlier date. roscelin seems never to have been appointed bishop. at a meeting of the royal court at sahagún on 6 february 1105, the king granted jerome, as bishop of salamanca, the church of san martín at zamora. jerome seems never to have been regarded as holding more than one bishopric at a time (plurality), but after his death, the dioceses were definitively restored at zamora and ávila (1121). jerome returned to the royal court at sahagún in december 1105, but he did not regularly stay at either the king's court or the duke's.