This is a copy after the fresco by Antonio Campi, datable 1560-64, in S. Paolo Converso, Milán. The late eighteenth-century Italian copyist may have been the same as was responsible for the drawing of the Mystic Marriage of St. Catherine. The entire verso of the sheet is covered with pen trials and miscellaneous scribbles.

According to the Golden Legend, Patroclus fell from a ladder placed against a window of Nero´s palace Nero´s palace to allow him to hear the sermon of St. Paul.

Turner, Nicholas, From Michelangelo to Annibale Carracci. A century of Italian drawings from the Prado, Chicago, Art Services International, 2008, p.281