The data was produced as part of a three-year research project on the topic of "Computational modelling of law -Sustainable legal AI from Roman legal sources" conducted at the University of Surrey School of Law since November 2019. The project aims to create a computational model in the laboratory conditions of a historical legal system based on Justinian's corpus of Roman law (533-535 CE) and focuses on three cascading layers: (1) the compositional and conceptual structure of legal texts; (2) the network of legal concepts and axioms; and (3) the logic of legal rules. Developed functionalities will be adapted to address challenges of modern law and legal technology. The relational database of the Digest is the result of investigations at the first layer.(2) Methods Information was pulled from three types of sources: (1) the text of the Digest, (2) research papers reconstructing the Digest's compositional structure, and (3) encyclopaedia and dictionary articles, and other sources about the jurists quoted in the Digest.