peer reviewedDuring the 1638 Roman Carnival, at Palazzo della Cancelleria, Cardinal nepote Francesco Barberini sponsored the performance of “San Bonifazio”, a hagiographic opera composed by Virgilio Mazzocchi on a libretto by Giulio Rospigliosi – alias the future Pope Clement IX. According to the available sources, before being apparently forgotten, the opera was staged again other at least three times. Although its text is transmitted by a considerable number of manuscript witnesses (only one copy of the score, at least twenty-four copies of the libretto), this melodramma has been deemed to be of a minor importance in the history of seventeenth-century opera. An interesting aspect that has been addressed only incidentally is the circulati...