Answer:
The Code.
Explanation:
The Justinian Code is the most important collection of Roman law, passed by order of Emperor Justinian, who gave the commission of jurists the task of collecting and codifying the entire legal legacy of the classical period.
Thanks to the fact that the text of Justinian Code has been preserved, we have been enabled to learn and study a huge number of facts about Roman law and to reconstruct the works of Roman jurists that have not been preserved. The existence of the Justinian Code, the activity of glossators, and representatives of the school of elegant jurisprudence enabled the reception of Roman law.