Matthew Lewis

Madrid, in the seventeenth century. Abandoned at the doorstep of a monastery, Ambrosio has been brought up by the Capucin Friars. After becoming a friar himself, he becomes an unrivaled preacher whose sermons draw crowds and earn him the admiration of all. Admired for his extreme rigor and absolute virtue, Ambrosio is certain he is safe from any temptation. But Satan has not said his final word (imdb)

Ambrosio (Franco Nero) is a monk who is sexually tempted by an emissary of the Devil, a young girl in monk's robes. After he has committed numerous crimes, it appears that he will be caught and punished by the Inquisition. Instead, he signs up on the Devil's team and wins his freedom.. and eventually, the papacy. (imdb)