Definition
In Roman law, fasti (singular: fastus) refers to lawful or court days — those days on which the praetor was legally permitted to administer justice and pronounce judgment. The term derives from the Roman calendar system that classified each day of the year according to its legal and religious character. A dies fastus was a day on which legal proceedings could proceed; a dies nefastus was a day on which they could not. The fasti as a whole constituted the official Roman calendar, which organized civic, religious, and juridical life by designating when courts could sit, when festivals were observed, and when public business could lawfully be conducted.
In legal usage, fasti is encountered almost exclusively in the context of Roman law and its influence on civil law systems. It is not a term of art in modern common law practice.
Common Language
Modern common usage (Wiktionary): The calendar of ancient Rome, which designated days for festivals, courts, and other civic occasions, roughly equivalent to a modern almanac. Also used more broadly for registers or records of important events.
Historical common usage (Webster's 1913): The Roman calendar giving days for festivals and courts. Records or registers of important events.
Editorial note: The common and legal meanings here are closely aligned, but the legal usage is narrower. Ordinary usage treats fasti as a historical or literary reference — most familiar from Ovid's poem of the same name — while the legal meaning focuses specifically on the juridical classification of days as lawful for court proceedings. A researcher encountering fasti in a legal source should read it in its calendrical-juridical sense, not merely as a synonym for "records" or "annals."
Why It Matters in Research
Fasti appears in legal dictionaries primarily as a gateway term directing researchers to DIES FASTI, where the substantive doctrine is treated. Bouvier does nothing more than make this redirect explicit. Researchers working in Roman law, civil law history, or comparative legal systems will encounter fasti most often in discussions of the praetor's jurisdiction and the procedural constraints governing Roman courts.
The critical research point is temporal and procedural: Roman legal proceedings were not merely limited by subject matter or standing — they were constrained by the calendar itself. A judgment rendered on a dies nefastus could be void. This calendrical dimension of procedural validity has no direct analog in common law systems, which creates a conceptual gap for researchers trained in Anglo-American procedure. When reading translated Roman law sources or early civil law commentaries, fasti and its cognates signal this distinct procedural world.
Researchers consulting Black's should note the appended maxim — "Fatetur facinus qui judicium fugit" (He who flees judgment confesses his guilt) — which appears to have been placed adjacently in the original text by alphabetical proximity rather than substantive connection to fasti. Do not treat this maxim as doctrinally related to the term.
Historical Dictionary Support
Black's and Bouvier's are in complete agreement on the core meaning: fasti denotes lawful days in Roman law, and both entries function primarily as cross-references to DIES FASTI rather than independent treatments. Neither source develops the term beyond its calendrical definition, and neither addresses the broader literary or annalistic sense of fasti that appears in classical scholarship.
What the historical legal dictionaries omit is significant. They do not explain the classification system underlying the Roman calendar — the distinction among dies fasti, dies nefasti, dies comitiales (days for popular assemblies), and dies intercisi (days divided between lawful and unlawful hours). This fuller framework is necessary to understand why fasti mattered procedurally and is better sought in Roman law treatises and civil law histories than in these dictionary entries.
Jurisdictional Note
Fasti as a legal term is confined to Roman law and civil law systems historically derived from it. It has no operative meaning in common law jurisdictions. Researchers working in Louisiana, Quebec, or other mixed jurisdictions may encounter the concept in historical sources but will not find it functioning as live procedural doctrine.