He was a saint of the 19th century that assisted and lead exorcisms. According to Father Gabriele Amorth he once freed a woman of her possession by going to participate in the celebration of Mass dressed in his sacred vestments. It is said that by him simply entering the chapel with these intentions were what liberated her.
Amorth, G., Stimamiglio, S., & Fasi, C. J. (2016). An exorcist explains the demonic: The antics of satan and his army of fallen angels. Sophia Institute Press.