Answer :
Institutiones- A collection of rules, laws, and decrees of previous emperors
codex constitutionum- A collection of new laws passed by Justinian
digesta - an early form of a legal textbook
novellae- a collection of decisions, or rulings, on previous laws.
From 529 to 565 CE, the Code of Justinian, Latin Codex Justinianus, formally Corpus Juris Civilis ("Body of Civil Law"), was a collection of laws and legal interpretations sponsored by the Byzantine emperor Justinian I.
The works were not intended to create a new legal code. Rather, Justinian's jurist committees produced essentially two reference works containing collections of past laws and extracts of the great Roman jurists' opinions.
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