Definition
*Infra corpus comitatus* (the correct form; see COMMON CONFUSION below) is a Latin phrase meaning "within the body of the county." In English law, it describes waters or territory that fall entirely within the geographic boundaries of a county — as distinguished from waters that are tidal, navigable, or otherwise subject to admiralty jurisdiction. The phrase operates as a jurisdictional locator: where a body of water or a place lies *infra corpus comitatus*, it is within the reach of the common law courts and beyond the admiralty's jurisdictional claim.
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Common Confusion
The headword as presented — INERA CORPUS COMITATUS — appears to be a scribal or typographic corruption of the standard Latin phrase *INFRA CORPUS COMITATUS*. "Infra" (meaning "within" or "below") is the operative preposition; "inera" is not a recognized Latin term and appears in no authoritative legal source. Researchers encountering either form in historical documents should treat them as the same phrase. The corruption is noted here because it may appear in older printed indexes, handwritten records, or imperfect transcriptions, and a researcher searching only for "inera" would miss the substantive legal history attached to the correct form.
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Why It Matters in Research
The phrase sits at the historical intersection of two competing English jurisdictional systems: the common law courts (including the county courts and King's Bench) and the High Court of Admiralty. The boundary between them was fiercely contested from the medieval period through the seventeenth century. Whether a particular stretch of water was *infra corpus comitatus* — and thus common-law territory — or subject to admiralty was not merely academic; it determined which court heard the dispute, what rules applied, and what remedies were available.
For corpus researchers, several traps exist. First, the phrase appears almost exclusively in English sources and has little direct American counterpart, since U.S. admiralty jurisdiction developed on different constitutional and statutory foundations. Do not assume the English doctrine maps cleanly onto American cases. Second, historical sources before the mid-nineteenth century may use the phrase loosely, sometimes referring to territorial extent generally and not strictly to the admiralty/common-law divide. Third, the phrase is closely tied to the older doctrine that admiralty jurisdiction extended only to the high seas and tidal waters — a boundary that English courts repeatedly litigated and that Parliament ultimately addressed through the Admiralty Court Acts of the nineteenth century. Researchers reading pre-1840 English materials on maritime jurisdiction should treat *infra corpus comitatus* as a signal that a jurisdictional contest is either present or nearby.
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Historical Dictionary Support
Black's Law Dictionary (2nd Ed.) provides the sole historical dictionary entry for this phrase in the Law Mind corpus. Black's defines it concisely as "[w]ithin the body (territorial limits) of a county," and notes that waters *infra corpus comitatus* are exempt from admiralty jurisdiction under English law. The entry is accurate but thin. It captures the definitional core without situating the phrase in the larger jurisdictional conflict that gave it practical significance. Black's does not address the contested historical boundary between tidal and non-tidal waters, nor does it note the degree to which this doctrine was specific to the English admiralty system. No other historical dictionary in the current Law Mind corpus covers this phrase independently, which means Black's 2nd Ed. is both the starting point and the ceiling of dictionary-level support. Researchers needing depth beyond that definition must move to treatise and case sources in English maritime and admiralty history.
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Jurisdictional Note
This phrase is a term of English law with no direct statutory equivalent in American jurisprudence. U.S. admiralty jurisdiction is grounded in Article III of the Constitution and federal statute, and turns on navigability and connection to interstate or foreign commerce rather than on the county-body test. The phrase may appear in American cases decided under English common law precedent, particularly in the early federal period, but it should not be read as stating current American doctrine.
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