Leonardo Bruni (or Leonardo Aretino) was an Italian humanist, historian and statesman. Title from colophon. Written on vellum in littera humanistica textualis by Amerigo Corsini mostly between 38 and 40 lines long and with some initial letters illuminated in coloured inks. Illumination attributed to Francesco d'Antonio del Chierico. Pages numbered by a different hand. Includes fragment (fly-leaves B and C): Commentatio in decem libros ethicorum Aristotelis, in Italian littera hybrida.