The correct answer is: "Rome".
Justinian I was a Roman Emporar who has become famous for rewriting the legal code of Roman Law, denominated Corpus Juris Civilis.
Justinian I gathered and re-wrote Roman law, specially fundamental works in jurispridence and civil law. These compilations are sometimes denominated the Code of Justinian. Current civil law in many states is based on the codes from the Justinian era.