Forlì, Biblioteca Comunale Saffi, ms. Fondo Piancastelli, sez. Carte Romagna B 538/7

In his lecture on RVF 366, Attendolo provides an argumentative-rhetorical analysis of the poem, dealing thoroughly with the two-fold subject of the canzone (a divine one: the praise of the Virgin; and a human one: the history of the poet as a sinner), its style, its genre and metre (with many numerological reflections on the number of verses and stanzas), as well as providing a short summary of each strophe. Furthermore, Attendolo maintains that Petrarch decided to conclude his book of rhymes with a poem devoted to the Virgin to imitate the Greek and Latin lyrical poets who closed their poetical collections with hymns to the gods.
 
Reference is made (among others) to some RVF poems (including RVF 23) and some sixteenth-century commentators of Petrarch (including Ludovico Castelvetro, Sebastiano Fausto da Longiano, and Giovanni Andrea Gesualdo), as well as to Augustin, Girolamo Cardano, David, Homer, Horace, Orpheus, Pindar, Plato, and Girolamo Ruscelli.