The sources of Roman Law discussed below are those which comprised the ius scriptum in Justinian's time.
- Leges
Those laws resulting from the deliberations of the Roman people in their assemblies on the proposals of magistrates were known as leges. Leges Regiae (enactments of the Kings) were laws supposedly enacted by the early Kings of Rome. The foundation of Roman Law was considered by the Romans to be the lex embodied in the XII Tables.
