The Justinian Code, also known as „Body of Civil Law” is the collection of laws and legal interpretations developed under the Byzantine emperor Justinian I from 529 to 565. The Justinian code consists of four books: Codex Constitutionum, Digesta, or Pandectae, Institutiones, and Novellae Constitutiones Post Codicem. They were intended to be the sole source of law. Reference to any other source was forbidden.