 It was compiled, at least in part (folios 81–90), by Ciriaco d'Ancona, and based on one of his three visits to Athens (1436, 1437–8, and 1444).With the aid of a scribe and a draughtsman, Ciriaco created a portfolio of sketches of several ancient Greek ruins, most notably the Parthenon, for Pietro.Pietro possessed an exemplary copy of the "Chronicon" of Eusebius in Jerome's translation.