Leges regiae
The leges regiae ("royal laws") were early Roman laws, which classical historians, such as Plutarch, mentioned had been introduced by the Kings of Rome.
Though sometimes questioned, scholars generally accept that the laws (or their ultimate sources) originated very early in Roman history, even as early as the period of the Roman Kingdom. For example, recent research has discovered previously unknown fragments quoted by ancient writers and some changes have been made about attribution to the various kings.