"Li prodigi della divina grazia nella conversione e morte di San Guglielmo duca d'Aquitania" is a "dramma sacro" in three acts composed 1731 by Pergolesi as student of the Conservatorio dei Poveri di Gesù Cristo on a libretto by Ignazio Maria Mancini. The manuscript is conserved in the library of the Conservatorio di San Pietro a Majella in Naples. It was played in the cloister of the Sant’Agnello church, one of the most ancient churches of Naples, also named Sant’Aniello a Caponapoli because of its position at the higest point of the old city. It is a "dramma sacro" in the best napolitan tradition, full of an extreme religiosity but with a wonderful touch of lightiness through the funny charachter of Cuosemo, a napolitan speaking "miles gloriosus" who wordly lead us during the whole opera. This mix is directly connected with the napolitan tradition of musicals theatre during the religios festivities that connects the medieval sacred rapresentations, with the religious musical theatre of the XVIII century, to the (still today surviving) christams napolitan theatrical rite of the “Cantata dei pastori”. The barely popular elements cohabit with the extremely dramatic plot of San Guglielmo creating two parallel plots: San Gugliemo and his napolitan "Sancho Panza". Both, initially proud soldiers, end the opera dead the saint and (willing or not) as a monk the poor Cuosemo. Alraune recording is the first wohle recording on period instruments of this masterpiece. Release for the label NovAntiqua: september 2019.