Definition
A Latin clause meaning "unless you shall have done" (literally, "unless you shall do"), appearing in early English manorial writs. The clause directed that if the lord of a manor failed to render justice to the complainant, the king's court or royal officer would step in and exercise jurisdiction over the matter itself. The phrase functioned as a conditional command: it gave the lord first opportunity to do justice, but made royal intervention automatic upon his failure.
Common Language
Wiktionary: No entry for nisi feceris as a phrase. The component word nisi means "unless" in Latin, used in English legal contexts to denote conditionality. Feceris is the second-person singular perfect subjunctive of facere, meaning "to do" or "to make."
Webster's 1913: No entry for nisi feceris. Webster's defines "nisi" as a legal term: "unless; — used in the names of certain proceedings before it becomes absolute or is made so."
The common-language components are both Latin and carry no independent everyday meaning in English. The phrase is pure legal-historical jargon. No meaningful gap exists between common and legal usage; COMMON LANGUAGE is noted here only to confirm the absence of a common-use counterpart.
Why It Matters in Research
The nisi feceris clause is not merely a procedural nicety — it is one of the mechanisms through which royal jurisdiction expanded at the direct expense of private feudal courts during the medieval period. Researchers encountering this phrase in primary sources, case law, or historical treatises should treat it as a marker of jurisdictional transition, not simply a formal writ formula.
Several traps await the unwary researcher. First, the phrase appears almost exclusively in pre-modern sources and in historical commentary on those sources; it drops out of active legal usage well before the nineteenth century. A researcher searching Law Mind sources for nisi feceris will need to look in materials dealing with manorial law, feudal tenure, and early English writ practice — not in modern procedural texts. Second, the phrase is easily confused with other nisi constructions in English law (nisi prius, nisi decree) that survived into modern practice; those terms are functionally unrelated. Third, the clause is not a standalone writ but a component clause within writs, meaning the relevant source material may not be indexed under this phrase at all.
The jurisprudential significance is substantial: the nisi feceris mechanism was one of the primary tools by which the common law courts systematically drew litigation away from baronial and manorial courts. Understanding this clause helps researchers trace the structural expansion of royal jurisdiction and the corresponding erosion of private feudal adjudication that shaped the common law's development through the thirteenth, fourteenth, and fifteenth centuries.
Historical Dictionary Support
Black's Law Dictionary is the primary historical dictionary source for this term, and its entry is terse but accurate. Black's identifies the clause as appearing in "old manorial writs," correctly characterizes its function as a conditional trigger for royal intervention upon the lord's failure to act, and cites Stimson's Law Glossary (Stim. Law Gloss.) as the underlying authority — a citation researchers should treat as a pointer to specialized historical glossary material rather than a primary source.
Black's entry does not explain the procedural mechanics of how the clause operated in practice, nor does it situate the term within the broader historical narrative of jurisdictional competition between royal and feudal courts. It gives the definition without the context needed to use it as a research tool. Researchers should supplement Black's entry with historical treatments of English writ practice and manorial jurisdiction, where the practical operation of such clauses is analyzed more fully.
No other entries in the surveyed historical dictionary corpus address nisi feceris directly. The absence of this term from later legal dictionaries reflects its obsolescence as a working legal concept rather than any ambiguity about its historical meaning.
Jurisdictional Note
Nisi feceris is a historical term of English law with no current operational meaning in any common law jurisdiction. It has no American analogue and does not appear in modern statutory or procedural codes. Jurisdictional variation is not a relevant research concern for this term.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia — Manorial Courts (for the court structure within which the clause operated); Feudal Jurisdiction (for the broader competition between royal and private courts); Writs (for the writ forms in which the clause appeared).