Definition
Latin: "It runs upon four feet." A phrase used in legal argument to indicate that a cited case applies exactly and completely to the matter at hand — that the precedent fits the present facts on all points without qualification or distinction. The expression is functionally equivalent to the modern advocacy shorthand "on all fours," meaning a prior decision is directly on point in both its facts and its legal reasoning.
When a lawyer or judge says a case *currit quatuor pedibus*, the claim is not merely that the precedent is relevant but that it is controlling: the same parties, the same legal issues, the same operative facts, and the same procedural posture all align. Conversely, to deny that a case *currit quatuor pedibus* is to argue that some material distinction exists sufficient to limit or distinguish the authority being invoked.
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Common Confusion
CURRIT QUATUOR PEDIBUS vs. ON ALL FOURS: These are not two different doctrines — they are the same concept at different historical moments. The Latin phrase is the formal ancestor of the modern colloquialism "on all fours." Researchers encountering the Latin form in older materials should recognize it immediately as the equivalent of the modern phrase. Neither expression describes a rule of law; both describe a relationship between cases. A court asserting that a precedent runs *quatuor pedibus* is making an argument about fit, not announcing a binding formula.
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Why It Matters in Research
This term is a navigational marker in older case law and legal argument, not a substantive legal doctrine. Its primary research value lies in identifying where courts or counsel were making strong precedent-alignment arguments. When you encounter *currit quatuor pedibus* or its abbreviated form *quatuor pedibus* in a historical opinion or brief, it signals a pivot point: the writer is claiming maximum precedential force for the case being cited, and any counter-argument will attempt to show that the cases do *not* run on all fours.
Several practical traps exist for researchers working in historical sources:
First, the phrase appears in varying truncated forms. Reporters sometimes record only *quatuor pedibus* without the full Latin, and occasionally the English gloss "upon all fours" appears without any Latin at all. A search limited to the full Latin phrase will miss instances recorded in its shortened or translated form.
Second, the term crosses into equity, common law, and early constitutional argument without disciplinary restriction. It is not confined to any particular area of substantive law, which means it may surface in contract, property, criminal, and procedural contexts alike.
Third, the modern replacement phrase "on all fours" carries the same meaning but no longer signals the same rhetorical weight. In earlier periods, invoking *currit quatuor pedibus* was a deliberate formal assertion of complete precedential identity. Modern usage of "on all fours" is comparatively casual. Researchers tracing the rhetorical weight of precedent arguments across time should account for this shift.
The phrase also connects corpus-wide to discussions of distinguishing cases, the doctrine of *stare decisis*, and the treatment of persuasive versus binding authority. Finding it in an opinion tells you the court or advocate was engaged in a precise argument about the scope of a prior ruling, which often signals that the underlying legal question was contested.
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Historical Dictionary Support
Black's (both editions) and Burrill's align precisely on the definition, with nearly identical text, suggesting a shared source or common tradition of transmission. All three sources translate the phrase as "it runs upon four feet" and immediately gloss it as equivalent to "upon all fours." None of the historical dictionary entries treats the phrase as having any meaning beyond its role as an advocacy or argumentative descriptor.
The quotation shared across Black's and Burrill's — "It does not follow that they run *quatuor pedibus*" from 1 Wilson's King's Bench Reports 145 — is instructive. The phrasing is negative: the court is denying that two cases are fully parallel, which confirms that the phrase operated as a contested claim subject to rebuttal, not a self-executing rule.
Rapalje & Lawrence offers only a cross-reference, adding no independent substance. The historical dictionaries collectively say little about when the phrase fell out of active Latin use in favor of the English "on all fours," which appears to have been a gradual transition through the nineteenth century. This silence is itself useful: the Latin form was clearly understood by practitioners well into the period when Black's first edition was compiled, suggesting it remained a live phrase in formal legal writing through at least the late nineteenth century.
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