Roman law

Lore & Background

The jurist Sextus Pomponius said that at the beginning of the city, the people began without fixed law, ruled despotically by kings. The first legal text of Roman law is the Law of the Twelve Tables, dating from the mid-fifth century BC. The plebeian tribune C. Terentilius Arsa proposed that the law be written to prevent arbitrary application by magistrates. After eight years of political struggle, the plebeians convinced the patricians to send a delegation to Athens to copy the Laws of Solon, and to other Greek cities. Modern scholars challenge the accuracy of Roman historians, generally not believing a second decemvirate occurred, and consider it unlikely that an official delegation was sent to Greece, suggesting instead that Romans acquired Greek legislation from Magna Graecia.

Reader's Guide

Roman law's most important contribution to European legal culture was not well-drafted statutes but the emergence of a class of professional jurists (prudentes) and a legal science, achieved by applying Greek philosophical methods to law. In the pre-classical period (c. After the Western Roman Empire's dissolution, Roman law remained in effect in the Byzantine Empire, with legal language shifting to Greek from the 7th century onward. Eastern European law continued to be influenced by Byzantine law. English and Anglo-American common law were also influenced by Roman law, notably in their Latinate legal glossary.

Did You Know?

• Roman law remained in effect in the Byzantine Empire after the dissolution of the Western Roman Empire.
• The jurist Sextus Pomponius said that at the beginning of the city, all things were ruled despotically by kings.

Defining the Boundaries of a Legal System

A legal system can be understood as an operational framework of institutions, procedures, and rules working together — a formulation John Henry Merryman put forward as an influential definition. But the exact boundaries of what counts as 'the system' remain contested. Some definitions restrict it to the body of norms issued by a single sovereign authority, while broader readings sweep in the courts, agencies, and interpretive processes that give those norms practical force. Nineteenth-century positivist John Austin anchored his definition in the identity of the sovereign legislator: every valid rule must trace back to the same source of authority. Hans Kelsen, writing in the twentieth century, shifted the criterion to a single foundational norm from which all other rules derive their validity. H.L.A. Hart offered yet another positivist lens, locating the system's coherence in a shared rule of recognition that tells participants which pronouncements count as law. Each of these accounts assumes a unified, internally consistent structure — an assumption that later pluralist scholarship would seriously challenge.

Taxonomies and the Blurring of Traditions

The most familiar way to sort the world's legal orders is into civil law, common law, religious law, customary law, and mixed systems. Yet modern scholarship has grown increasingly uncomfortable with these fixed boxes. The civil-law and common-law divide, once a crisp boundary, has softened as jurisdictions on both sides borrow techniques from the other, and as individual members drift further from their supposed family resemblance. The Nordic tradition of Scandinavia and Iceland, and the socialist legal systems of the twentieth century, are sometimes treated as standalone categories but more often absorbed into the civil-law umbrella. Perhaps most strikingly, mixed legal systems — once a marginal footnote — now dominate the global landscape. A 2000 survey of world legal systems counted 92 mixed systems against 91 civil-law and 42 common-law ones, suggesting that the neat two-family model has been overtaken by hybrid reality.

Pluralism and the Limits of Sovereign-Centered Theory

The positivist tradition — Austin, Kelsen, Hart — all presupposed that a legal system could be identified by tracing rules back to a single sovereign or foundational norm. Twentieth-century research on legal pluralism shattered that assumption by demonstrating that many binding norms circulate without any identifiable state legislator behind them. In Canada, for instance, the national legal framework coexists with numerous Indigenous legal systems, each drawing on distinct sources of authority and legitimacy. H. Patrick Glenn went further, arguing that the very concept of a discrete 'legal system' is structurally inadequate because it cannot capture the epistemic fuzziness and overlapping character of how law actually operates in communities. He proposed legal traditions as a more honest unit of analysis. Even the status of international law as a 'system' is disputed: Hart denied it one because it lacked rules of recognition, change, and adjudication, while Kelsen saw it as either nested within every national system or as an overarching order to which national systems were subordinate.

Power, Empire, and the Politics of Classification

The way legal systems have been categorized has rarely been a neutral academic exercise. In 1909, Adhémar Esmein proposed a five-group taxonomy — Roman, Germanic, Anglo-Saxon, Slavic, and Islamic — that mapped neatly onto the great empires of the era, while quietly excluding the legal traditions of Africa, China, and Japan as insignificant. Four years later, Georges Sauser-Hall offered an explicitly racial scheme dividing legal systems into Indo-European, Semitic, and Mongolian categories, embedding colonial hierarchies directly into the architecture of comparative law. These classifications reveal that the act of sorting legal orders has often served as a proxy for asserting geopolitical dominance, deciding which traditions merit scholarly attention and which do not. The modern turn toward recognizing mixed systems, Indigenous legal orders, and the fluidity between civil and common law can be read partly as a corrective to that imperial legacy — an acknowledgment that the world's legal reality is far messier, more numerous, and more diverse than any single empire's taxonomy could accommodate.