Along with the desire of the Catholic Monarchs to extend their dominion to all the kingdoms of the Iberian Peninsula, their reign was characterised by religious unification of the peninsula through militant Catholicism. Petitioning the pope for authority, Pope Sixtus IV issued a bull in 1478 to establish a Holy Office of the Inquisition in Castile. This was to ensure that Jews and Muslims who converted to Christianity did not revert to their previous faiths. The papal bull gave the sovereigns full powers to name inquisitors, but the papacy retained the right to formally appoint the royal nominees. The inquisition did not have jurisdiction over Jews and Muslims who did not convert. Since in the kingdom of Aragon it had existed since 1248, the Spanish Inquisition was the only common institution for the two kingdoms. Pope Innocent VIII confirmed Dominican Tomás de Torquemada, a confessor of Isabella, as Grand Inquisitor of Spain, following in the tradition in Aragon of Dominican inquisitors. Torquemada pursued aggressive policies toward converted Jews (conversos) and moriscos. The pope also granted the Catholic Kings the right of patronage over the ecclesiastical establishment in Granada and the Canary Islands, which meant the control of the state in religious affairs.