Poggio Bracciolini's personal manuscript of in Pisonem (1417)

Poggio Bracciolini, papal secretary and literary explorer, rediscovered texts of Quintilian, Asconius, Valerius Flaccus, Lucretius, Silius Italicus, Ammianus Marcellinus and ten hitherto unknown orations of Cicero. This book, containing eight of Cicero's recovered orations, was copied by Poggio while book-hunting in Cologne and Langres during the summer of 1417.

The colophon on fol. 49 verso may be translated, "This oration, formerly lost owing to the fault of the times, Poggio restored to the Latin-speaking world and brought it back to Italy, having found it hidden in Gaul, in the woods of Langres, and having written it in memory of Tully [Cicero] and for the use of the learned."

Original Source: http://lcweb.loc.gov/exhibits/vatican/humanism.html