Definition
Auxilium curiae (Latin: "aid of the court") is a procedural order issued by a court summoning a party to appear at the request and suit of another party, typically to warrant or guarantee some matter at issue. In its historical application, it was a mechanism by which a party already before the court could compel a third party — often a warrantor or voucher — to come into the proceeding and stand behind a claim, title, or obligation.
The term belongs to the vocabulary of early common law procedure, where courts exercised broad authority to bring in additional parties whose cooperation or guarantee was necessary to resolve a dispute fully.
Common Confusion
Auxilium curiae is easily confused with amicus curiae on superficial reading, but the two are entirely distinct. Amicus curiae ("friend of the court") is a voluntary or invited participant who offers information or argument to assist the court, without being a party. Auxilium curiae describes a compelled appearance — a party is summoned at another's request to warrant or answer for something. One is voluntary assistance; the other is coerced joinder. Researchers searching Latin procedural terms in historical sources should take care not to conflate them.
Why It Matters in Research
Researchers encountering auxilium curiae in historical sources should understand that the term operates almost exclusively within the procedural world of medieval and early modern common law. It appears most often in records concerning real property actions — particularly warranty of title — where a grantee facing an adverse claim could summon the grantor (or warrantor) to defend the title they had conveyed.
The practical significance: if a researcher finds auxilium curiae in plea rolls, Year Books, or early equity records, the surrounding context will almost always involve a vouching-to-warranty transaction or an analogous compulsion of a third party. The term is rarely encountered in post-seventeenth-century sources because the procedural forms it belonged to were gradually superseded by reformed common law pleading and, eventually, by modern third-party joinder and impleader rules.
The single citation in Bouvier — Kennett's Parochial Antiquities — signals that by the time Bouvier compiled his dictionary, auxilium curiae was already being treated as antiquarian material. Researchers should not expect to find this term in American case law as an operative procedural device; its relevance to American legal research is almost entirely historical and comparative.
Cross-corpus trap: Do not conflate this term with the broader concept of amicus curiae ("friend of the court"), which is a distinct and still-living procedural concept. The superficial Latin similarity can mislead.
Historical Dictionary Support
Bouvier's Law Dictionary provides the only entry in the Law Mind shelf corpus, defining auxilium curiae as "an order of the court summoning one party, at the suit and request of another, to appear and warrant something," citing Kennett's Parochial Antiquities (p. 477). The definition is terse, and Bouvier offers no further development of the term's procedural mechanics or historical range.
White Kennett's Parochial Antiquities (1695) is a work of ecclesiastical and legal antiquarianism focused on English parish custom and early common law practice — its context confirms that auxilium curiae was already being treated as a subject of historical inquiry rather than living practice by the late seventeenth century.
No other shelf sources address this term. The historical dictionaries' silence is itself informative: by the nineteenth century, when most of the Law Mind dictionary corpus was compiled, auxilium curiae had passed out of active legal vocabulary. Researchers should look to earlier sources — medieval plea rolls, Fitzherbert's Natura Brevium, or Coke's reports — for the term in its operative procedural context.
Jurisdictional Note
Auxilium curiae is a term of English common law origin. It did not migrate into American statutory or procedural codes as a named device. The functions it historically served — compelling a warrantor to appear and defend title — were absorbed into common law warranty doctrine and, later, into modern rules governing third-party practice.