Nowadays Justinian's greatest achievement is considered the Corpus Juris Civilis, or Justinian Code (a compendium and revision of centuries or Roman law) because it has influenced the later development of civil law in Europe. However, we do not have any information about its impact at the time. In his days his reconquest of Italy, Tunisia and western Algeria, and southern Spain was probably considered his greatest achievement.
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The impact of the Corpus Juris Civilis in the days of Justinian is not known. The Corpus Juris Civilis was a collection of books which included:
1) The Codex (book) Justinianus, 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 views among jurists which arose from centuries of poorly organised development of Roman law and have a uniform and 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 is a collection of fragments taken from essays on laws written by jurists (mostly from the 2nd and 3rd centuries) which express 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 is 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.
This work was forgotten until it was discovered in a library in Pisa in 1070. It had a big impact. Bologna University (established in 1088) was the first university in Europe and its major appeal was its faculty of law, which had four professors who specialised in studying interpreting this work. It attracted students all over Europe. The Corpus Juris Civilis became the plank of the development an emerging class of professional lawyers. It became the foundation of the law in the Italian city-states of the high Middle Ages and the Renaissance.
The Holy Roman Emperor Frederick I (reigned 1155--1190) was the first dynastic ruler to hire professional lawyers to run his administration, which became based on the "Justinian Code". The use of Roman law provided a new rationale for imperial rule as the emperors' traditional claim to divine right to rule had been challenged. Since Roman law was based on natural moral law and the principle of rationality, it provided a system of law of for the imperial state which was a reflection these principles and which was separate from religion. It also provided a framework which ensured consistency in administration.
The Corpus Juris Civilis was also used to formulate the Napoleonic Code in 1804. This replaced the existing uncoordinated and contradictory web of separate old feudal and royal French laws. This code was different than the Justinian Code, which was a collection of edited or revised extracts of law. It was more systematic. Nevertheless, the latter provided material which was important in the creation this code, which was Europe's first modern code of civil law. Following the French example, many continental European countries later also compiled their codes of civil law and they, too, used the Corpus Juris Civilis as its foundation.
it was very important to the people there and protected the city from attacks also it helped free slavery and argued the thought of killing dogs
Justinian reconquered part of the Western Roman Empire, retook the city of Rome (temporarily), built the Hagia Sophia, built great monuments and churches, and created (through his people) a new and improved law code, called Justinian's Code.
the justinian code lasted so long because it was fair and justifing
it was a code of laws that served as foundation of international law that is still used today
the Justinian code
the code is 1324