Definition
Jus Aelianum (also rendered in historical sources with variant spellings) refers to a body of Roman law compiled by Sextus Aelius Paetus Catus, a Roman jurist and consul of the early second century BCE. The compilation was organized in three parts: (1) the text of the Twelve Tables, the foundational early Roman legal code; (2) interpretations of and judicial decisions upon those laws; and (3) the forms of legal procedure (legis actiones) used in Roman courts. It represented one of the earliest systematic attempts to make Roman law accessible beyond a narrow priestly class.
The work is sometimes referred to in Roman legal history as the Tripertita — meaning "the three-part work" — in recognition of its tripartite structure. It is regarded as a successor and expansion of the earlier Jus Flavianum, which had previously broken the priestly monopoly on procedural legal knowledge by publishing the calendar of court days and formulae of action.
NOTE ON SPELLING: The term appears in the source material as "Jus Jblianum," which is a typographical corruption — almost certainly a printing or OCR artifact for "Jus Aelianum." This entry treats the term as Jus Aelianum, the historically attested form.
Common Confusion
Jus Aelianum is frequently mentioned alongside Jus Flavianum, and the two are sometimes conflated. They are distinct: Jus Flavianum, attributed to Gnaeus Flavius (a clerk to the jurist Appius Claudius), was the earlier work and is credited with first publishing the formulae of legal action for public use. Jus Aelianum followed, expanded the project, and incorporated the text of the Twelve Tables and their interpretation. Sextus Aelius was a jurist of considerably higher social and legal standing than Gnaeus Flavius. The two works represent sequential stages in the same historical process, not competing versions of the same thing.
Why It Matters in Research
Researchers working in Roman law, legal history, or the history of jurisprudence will encounter this term almost exclusively in secondary and historical sources, not in primary legal texts — the original work by Sextus Aelius does not survive. Its significance is historiographical: it appears in discussions of the democratization of Roman legal knowledge and the transition from priestly-controlled to publicly accessible law.
The chief research trap is the variant and corrupted spellings found in older printed legal dictionaries, including the "Jus Jblianum" form in the Black's supplemental edition used here. OCR artifacts and aging typefaces in 19th-century legal reference books frequently corrupt Latin terms, particularly those with ligatures or unusual letterforms. Any researcher encountering unfamiliar "Jus J—" formulations in historical legal dictionaries should treat the "J" as a possible corruption of "Ae," "Fl," or other digraphs.
A second navigational point: Jus Aelianum sits within a cluster of related early Roman legal milestones — the Twelve Tables themselves, the Jus Flavianum (compiled by Gnaeus Flavius), and later the work of classical jurists under the Principate. Research into any one of these will typically require orientation to the others. The Black's supplemental entry cross-references Jus Flavianum directly, making that a necessary companion lookup.
This term will not appear in most American or English common-law legal research. Its corpus relevance is confined to Roman law scholarship, comparative legal history, and foundational jurisprudence materials.
Historical Dictionary Support
Black's Law Dictionary (2nd Ed.), Supplemental, provides the only source entry here. It attributes the definition to Brown (likely Bouvier's or a similar 19th-century reference), identifying Sextus Aelius as the compiler, confirming the tripartite structure, and noting the chronological relationship to the Jus Flavianum — placing Jus Aelianum as the later of the two works.
The entry is brief and reliable as far as it goes, but it does not address the historiographical significance of the work, its non-survival as an independent text, or its role in the broader development of Roman jurisprudence. Researchers should not rely on Black's supplemental entries for Roman law concepts as comprehensive treatments — they are signposts, not analyses. Standard works in Roman legal history, including Jolowicz's Historical Introduction to the Study of Roman Law, provide the fuller scholarly context that dictionary entries in this vein deliberately omit.
No meaningful divergence exists among historical dictionaries on the core facts, as the term is well-defined and historically bounded.