Definition
A Latin term from Roman civil law referring to: (1) a magistrate — a judicial officer empowered to hear and determine causes, whose proper function was the inquiry into matters of law rather than matters of fact; and (2) the magistracy itself — the office, dignity, or position held by such an officer.
The distinction embedded in the term is significant: the magistratus was not simply a judge in the modern sense but an officer whose institutional role was oriented toward legal questions, separate from the factual determinations that might fall to other bodies or procedures in the Roman system.
Common Confusion
MAGISTRATUS should not be conflated with the English word "magistrate" as used in modern common law systems. While magistratus is the direct Latin ancestor of the English term, the Roman office it describes operated within a civil law framework with a formal law-fact division that has no direct equivalent in most modern Anglo-American court structures. A researcher encountering magistratus in a historical source is reading about a Roman or civil law institution, not a justice of the peace or lower-court judicial officer of the type routinely discussed in English and American legal materials.
Why It Matters in Research
Researchers are most likely to encounter magistratus in two contexts: translations or commentaries on Roman law sources (Justinian's Corpus Juris Civilis and its glossators), and in treatises on civil law or comparative jurisprudence written in English or Latin during the 17th through 19th centuries. Both Black's editions and Bouvier cite Hallifax's Civil Law as their authority, which signals that the working definition circulating in 19th-century American legal dictionaries traces back to a single analytical tradition rather than independent Roman sources.
The law-fact distinction embedded in the definition — that the magistratus inquired into law while other mechanisms addressed fact — is substantively important and easy to overlook when treating the term as a simple synonym for "magistrate." Researchers working on the historical development of the law-fact distinction, or on the jurisprudential roots of judge-jury allocation, will find magistratus a useful entry point into that literature.
Because the term is Latin and appears primarily in civil law contexts, it surfaces more frequently in Louisiana legal materials, Scottish and civilian legal scholarship, and ecclesiastical law sources than in standard common law materials. A researcher working in Louisiana's mixed legal tradition should be alert to the term appearing in contexts where its civil law meaning carries full weight.
Burrill's entry adds a secondary meaning — magistracy as an institution or office — that the other dictionaries omit. This secondary sense matters when the term appears in sources discussing the structure of Roman government broadly, rather than the function of a specific officer.
Historical Dictionary Support
All four source dictionaries agree on the core definition: a judicial officer empowered to hear and determine causes, with a proper function directed to questions of law rather than fact. The language is nearly identical across Black's (both editions) and Bouvier, suggesting a shared line of transmission through Hallifax's Analysis of the Civil Law.
Burrill's entry is the most complete. It alone supplies the Greek equivalent (ἄρχων), traces the etymology to magister (master), and records the secondary institutional meaning of magistracy or the office itself. The Hallifax citation in Burrill refers to the work as Anal. (Analysis) rather than Civil Law, reflecting a slightly different edition or referencing convention — researchers should note that both citations point to the same underlying work, John Hallifax's Analysis of the Civil Law.
What the historical dictionaries do not provide is context for how magistratus functioned within the broader architecture of Roman procedure — the relationship to the praetor, the iudex, and the formulary system. A researcher who needs that depth will need to move beyond these dictionary sources into Roman law scholarship proper.
Jurisdictional Note
Magistratus is a term of Roman and civil law with no formal standing in American common law jurisdictions. It appears with greater frequency in Louisiana legal sources and in ecclesiastical and admiralty law scholarship, where civilian influence is stronger. In common law jurisdictions it functions primarily as a term of art in historical and comparative legal analysis.