Corpus Juris Civilis
The Institutes of Justinian () is a unit of the "Corpus Juris Civilis", the sixth-century codification of Roman law ordered by the Byzantine emperor Justinian I. It is largely based upon the Institutes of Gaius, a Roman jurist of the second century A.D. The other units in the "Corpus Juris Civilis" are the "Digest", the "Codex Justinianus", and the "Novellae Constitutiones" ("New Constitutions" or "Novels").