He was an Italian boy who spent a life of pleasure in the world until one day he met Saint Philip Benizi. He struck Saint Philip in the face and when Saint Philip, in his humility, turned the other cheek, it so impressed Peregrine that he was converted and joined the Servites. While he was in ecstasy he was instantaneously cured of cancer. He is invoked as the patron saint to cure cancer.
Saint Peregrine (source)
