This paper describes two research projects, both involving Latin and Greek lexicography. They are undertaken at the University of Florence and at the Italian National Research Council respectively. The one involves the creation of a Dictionary of Justinian's constitutions based on the emperor's legislative lexicon formed in the Corpus Iuris and elsewhere. The most demanding aspect of this task has been the creation of the Dictionary of the Novellae. The other project involves the creation of a Lexicon of the Novellae in the Authenticum version.