Who was the great influence in the law code of Justinian's reign?

Answer 1

It is most likely that the people who influenced the Corpus Juris Civilis (Body of Civil Law, which was later dubbed Justinian Code) the most were Ulpian, Paulus and Gaius, three Roman jurists of the second century AD.

The Corpus Juris Civilis came in four parts:

1) The Codex (book) which was a review of imperial laws going back 400 years (to the time of Hadrian). It scrapped obsolete or unnecessary laws, made changes when necessary and clarified obscure passages. Its aim was to put the laws in a single book (previously they were written on many different scrolls), harmonise conflicting view among jurists which arose from centuries of poorly organised development of Roman law and have a coherent body of law. It consists of 12 books, 1 book covers ecclesiastical law, the duties of high officers and sources of law, 7 cover private law, 1 criminal law and 3 administrative laws.

2) The Digesta which was a collection of fragments taken from essays on laws written by jurists (mostly from the 2nd and 3rd centuries) and which expressed the private opinions of legal experts. Most were from Ulpian (40%) and Paulus (17%). It was a large amount of writing which was condensed in 50 books. It was used as an advanced law student textbook.

3) The Institutiones was a textbook for first year law students written by two professors. It was a series of extracts from statements on the basic institutions of Roman law from the teaching books by 'writers of authority.' In was largely based on the texts of Gaius, a jurist of the 2nd century AD.

4) The Novellae Constitutiones, which contained laws recently issued by Justinian.