Coming from the Quarto del Prior of the Certosa di San Martino, it is an intense psychological portrait and one of the most widespread images of the Neapolitan seventeenth century. Often referred by critics to Massimo Stazione, it is instead by the hand of Guarino, who trained in Naples with the naturalists followers of Caravaggio, in particular Ribera and the first Stanzione. The canvas can be dated to around 1640: the strong chiaroscuro of the saint's face is indicative of the naturalistic training of the master, while a sentimental vein and a subtle sensuality deprive the composition of sacredness. Of great quality is the dress and the very white cloth stained with blood that covers her breast, just mutilated.