Roman law

• 1. Introduction

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  Roman law, born in the mid-fifth century BC with the carving of the Twelve Tables, would go on to shape legal thinking for more than two thousand years. The German legal theorist Rudolf von Jhering once wrote that ancient Rome had conquered the world three times: through its armies, through its religion, and through its laws. He then added that each conquest was more thorough than the last. That third conquest is still unfolding. The French civil code came into force in 1804. Germany's civil code, the Burgerliches Gesetzbuch, followed in 1900. Legal systems in Latin America, Ethiopia, and most of continental Europe trace their roots to Rome. Even the English common law, which never fully adopted Roman practice, absorbed its Latin vocabulary and some of its core concepts.

  How did a legal tradition that began as unwritten custom under kings become the foundation of modern law across the world? The answers run through class struggle, the slow rise of professional jurists, the collapse of the Western Empire, and one Byzantine emperor's determination to save what remained.

• 2. The Twelve Tables

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  The plebeian tribune C. Terentilius Arsa set things in motion when he proposed that the law be written down so magistrates could not apply it arbitrarily. That proposal triggered eight years of political struggle before the plebeian class won a significant concession: the patricians agreed to send a delegation to Athens to study the Laws of Solon, and dispatches went to other Greek cities for the same purpose.

  In 451 BC, ten Roman citizens known as the decemviri legibus scribundis were chosen to record the laws. While they worked, they held supreme political authority, the imperium, and the ordinary power of magistrates was suspended. By 450 BC they had produced laws inscribed on ten tablets, but the plebeians found them unsatisfactory. A second set of decemviri is said to have added two more tablets in 449 BC, bringing the total to twelve. The people's assembly approved the result.

  Modern scholars read this account with skepticism. Many doubt that a second decemvirate ever convened, and most consider it unlikely that the patricians sent an official mission to Greece. A more plausible route for Greek influence runs through the cities of Magna Graecia, the Greek settlements in southern Italy that served as the main cultural bridge between the two worlds.

  The original tablets did not survive. They were almost certainly destroyed when the Gauls conquered and burned Rome in 387 BC. What fragments remain confirm that the Twelve Tables were not a comprehensive legal code. They targeted specific points of customary law that needed to change, with the largest share of their provisions dedicated to private law and civil procedure. That deliberate narrowness would define Roman legal practice for generations: the law as a living instrument, not a complete system handed down from on high.

• 3. The Rise of the Jurists

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  Around the year 300 BC, a man named Gnaeus Flavius is said to have published the formularies, the precise words a person had to speak in court to begin a legal action. Before that publication, those formulas were kept secret and known only to priests. Once they were in the open, anyone could study them. Whether or not the story is historically accurate, it captures something real: Roman legal science grew from the moment law stopped being a priestly mystery.

  The jurists who emerged were unlike anything the ancient world had seen. Rome's most consequential contribution to European legal culture was not its statutes, the source text argues, but this class of professionals, known as the prudentes, and the science they built. They applied the methods of Greek philosophy to law, a subject that Greek thinkers had never treated as a science.

  Quintus Mucius Scaevola wrote a voluminous treatise covering all aspects of the law during the republican period. Servius Sulpicius Rufus, a friend of Marcus Tullius Cicero, was another figure of that era. By around 27 BC, when the Republic gave way to the Principate under Augustus, Rome had already developed what the source describes as a very sophisticated legal system and a refined legal culture.

  Around 130 AD, the jurist Salvius Iulianus drafted a standard form of the praetor's edict, which all praetors would use from that point on. That edict catalogued every situation in which a praetor would allow a legal action or grant a defense, functioning in practice like a comprehensive law code even though it formally lacked the force of law. Later classical jurists like Paulus and Ulpian built extensive commentaries on it, and Ulpian gave the famous definition of praetoric law as that introduced by praetors to supplement or correct civil law for public benefit.

• 4. Law's Fracture Under Empire

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  By the middle of the 3rd century AD, the conditions that had allowed Roman legal culture to flourish began to deteriorate. Emperors assumed more direct control over political life, and the Principate, which had kept some features of the old republican constitution, slowly transformed into the absolute monarchy known as the Dominate. A class of jurists who regarded law as an independent science did not fit comfortably into a system where the emperor's will was the highest authority.

  Jurisprudential writing all but stopped. Few jurists after the mid-3rd century are known by name at all. Legal education and legal science persisted to some degree in the eastern part of the Empire, but in the west most of the subtleties of classical law were gradually forgotten. What replaced it was the so-called vulgar law of the late Roman Empire, a simplified and less technically refined body of practice.

  When Constantine moved the empire's center to the Greek East in the 4th century, new influences entered Roman legislation. Constantine himself began restricting the ancient concept of patria potestas, the absolute power a male head of household held over his descendants, by recognizing that those dependents could hold property rights of their own. Scholars read this as a concession to Greek-Hellenistic ideas about paternal authority, which were stricter in some respects than the old Roman custom. The Codex Theodosianus, issued in 438 AD, codified the laws of Constantine's line. Later emperors pushed further still, until Justinian decreed that a child under paternal authority became the owner of everything it acquired, with the single exception of property received from the father himself.

• 5. Justinian's Consolidation

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  In 529 AD, the Eastern Roman emperor Justinian I ordered a project that would define the next fifteen centuries of legal history: a comprehensive codification of Roman law known as the Corpus Juris Civilis. The compilation ran from 529 to 534 and gathered statutes, juristic writings, and imperial pronouncements into a single body of law.

  Praetoric law and civil law, which had developed alongside each other for centuries, were fused inside it. The work drew on classical jurists including Papinian, who had lived from 142 to 212 AD and whose definition of praetoric law the compilers preserved verbatim in Latin. From the 7th century onward, the legal language of the Byzantine East shifted to Greek, and the codes were gradually translated.

  In the 9th century, emperors Basil I and Leo VI the Wise commissioned a combined Greek translation of the Code and the Digest, the parts of Justinian's compilation that covered statutes and juristic writing. The result was known as the Basilica. Roman law as preserved in the Basilica and in Justinian's codes remained the basis of legal practice in Greece and in the courts of the Eastern Orthodox Church even after the Ottoman conquest of Byzantium.

  The reach extended to Africa as well. Together with the Syro-Roman law book, these texts formed much of the basis for the Fetha Negest, a legal code that remained in force in Ethiopia until 1931.

• 6. The Medieval Revival

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  After Justinian's political authority faded in the West, his legal texts largely vanished from practical use. The Digest, the richest compilation of classical juristic writing, was ignored for several centuries. Then, around 1070, a manuscript of the Digest was rediscovered in Italy.

  What followed was a slow transformation of European intellectual life. Scholars called glossators began annotating the ancient texts, writing comments between lines in what was called glossa interlinearis, and adding marginal notes in glossa marginalis. The center of this study was Bologna, and the law school there gradually grew into Europe's first university. Students who trained there found that Roman rules were better adapted to regulating complex economic transactions than the customary law prevailing across Europe.

  Kings and princes actively encouraged the revival. Many employed university-trained jurists as counselors and court officials, and they were drawn in particular to the principle, initially coined by the jurist Ulpian, that the sovereign is not bound by the laws, expressed in Latin as princeps legibus solutus est.

  By the middle of the 16th century, the rediscovered Roman law dominated legal practice across much of Europe. It had merged with elements of canon law and Germanic custom, especially feudal law, into a system known as ius commune, common to all of continental Europe and to Scotland. England and the Nordic countries were the main exceptions. The English legal system was already more developed than its continental counterparts when Roman law was rediscovered, so its practitioners saw less advantage in switching. English lawyers trained at the Inns of Court in London rather than at the civil and canon law faculties of Oxford or Cambridge. Still, elements of Roman law entered English equity courts, and in the early 19th century English lawyers and judges were willing to borrow directly from Roman and continental sources.

• 7. The Living Inheritance

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  National codifications eventually replaced the shared ius commune. France's civil code came into force in 1804. Through the 19th century, other European states followed, either adopting the French model or drafting their own. Germany was delayed by its political fragmentation; in some German territories, Roman law remained directly applicable until the BGB took effect in 1900. Colonial expansion then carried civil law systems across the Americas and beyond.

  Today, Roman law is no longer applied directly in any major court. Yet the legal systems of countries such as South Africa and San Marino remain based on the old ius commune, and no modern code broke entirely with Roman tradition. The provisions of Roman law were fitted into more coherent national systems and translated into national languages, but the underlying rules travel with them.

  For that reason, Roman law remains a mandatory subject for law students in civil law jurisdictions. The annual International Roman Law Moot Court was developed to train students and to build connections across borders. As the European Union works toward a unification of private law among its member states, the old ius commune, which once provided a shared legal foundation across Europe while allowing for local variation, is frequently cited as a model. The Institutes of Gaius, written during the classical period, divided all private law into persons, things, and legal actions; that same structure was acknowledged in William Blackstone's Commentaries on the Laws of England and carried into the French Code civil and the German BGB, an unbroken thread running from the second century AD to the present.