The antiquarian, philologist, bibliophile and humanist Angelo Colocci (1474-1549), whom Leo X counted among his officers and companions, left a large number of as yet unpublished study notebooks, which are kept in the Vatican Library. They reflect the authorís critical thought, which was so inspiring and stimulating to the intellectuals who were in contact with him (Bembo, Castiglione, Tebaldeo...). This volume presents the first complete, critical edition of one of these complex notebooks. The detailed commentary attempts, through constant reference to the known part of Colocciís library, to organize the heterogeneous information provided here in a systematic way. The contents include poetical texts; notes on the De Amore of Andrea Cappellano; an extensive gallery of portraits of poets Ė the provenzali, the stilnovisti, Petrarch, Robert of Anjou and their contemporaries, fifteenth-century poets and versifiers personally known to Colocci; reflections on language and on the nature of jest. An appendix completes the volume, containing previously unpublished excerpts from Colocciís correspondence and from other manuscripts which belonged to him.