What name is given to the Roman law compilation commissioned by Justinian I?

The Roman law compilation commissioned by Justinian I is called the Corpus Juris Civilis.

Justinian ordered the major legal project in Constantinople during the 6th century. The work gathered imperial enactments and earlier legal opinions into an organized body of law. Its principal parts are the Codex, Digest, Institutes, and later Novels. The Latin title Corpus Juris Civilis was applied later; Justinian’s original Greek and Latin materials were not published under that exact collective name.

The Codex collected imperial constitutions. The Digest excerpted writings by earlier jurists, while the Institutes served as a textbook for law students. The Novels contained laws issued after the first code.

The compilation strongly influenced medieval and modern civil-law systems, especially after its study revived in Italian universities. It should not be confused with the Twelve Tables, an early Roman law display created many centuries earlier.