Who is Father Cayetano, Monsignor Cayetano Delaura from Of Love and Other Demons and what is their importance?

Father Cayetano enters the story as an austere priest and librarian. He is the close confidant of the Bishop. Cayetano reluctantly obeys the Bishop and takes charge of the exorcism of Sierva. However, he quickly falls in love with the girl. Cayetano is one of the two characters in the novel who is a scholar.