Gabriele Amorth was known as the James Bond of Exorcism and a catholic priest. the ‘ Pope’s Exorcism’ film by Edward Siebert is based on....
https://factswow.com/movies/father-gabriele-amorth-and-the-movie-the-popes-exorcist-inspired-by-the-chief-exorcist-of-the-vatican-in-the-late-1980s