In 1103, Gregory wrote the "Largitorium", or "Liber Notarius sive emphiteuticus", a lengthy list of all the concessions, or grants, made by the monastery to its tenants. Having collected all this detailed information, he set to work on a history of the monastery, the "Chronicon Farfense"; and when he was 70 years old, in order to facilitate reference to his earlier works, he compiled a sort of index which he styled "Liber Floriger Chartarum cenobii Farfensis". Gregory was a man of real learning, remarkable in that, as early as the eleventh century, he wrote history with accuracy of view-point, and a great wealth of information.