Definition
In Roman and civil law sources, *primus* (Latin: "first") is a conventional placeholder name used by jurists to identify the first party in a hypothetical legal illustration. It functions like the modern convention of "Party A" or "A.B." — a generic stand-in, not a reference to any real person. Paired with *secundus* (second), *tertius* (third), *quartus* (fourth), and so on, it allowed Roman jurists in the Digest and later commentators to construct fact patterns without attaching names to fictional actors.
The term also appears in English legal writing as a descriptive label meaning "the first" — used to distinguish the first of several persons bearing the same name in a legal instrument or proceeding (e.g., *John Smith primus* versus *John Smith secundus*).
Common Language
Modern common usage (Wiktionary): One of the bishops of the Scottish Episcopal Church, who presides at the meetings of the bishops, and has certain privileges but no metropolitan authority.
Historical common usage (Webster's 1913): One of the bishops of the Episcopal Church of Scotland, who presides at the meetings of the bishops, and has certain privileges but no metropolitan authority.
The common meaning of *primus* in English ecclesiastical usage — a presiding bishop without metropolitan authority — has no connection to its legal meaning. Researchers encountering *primus* in a legal text should not import the church governance sense. The two usages share only the underlying Latin sense of "first in rank or order" and diverge entirely in application.
Common Confusion
*Primus* is sometimes loosely treated as synonymous with *prima* (as in *prima facie*) or confused with compound terms like *imprimis* ("in the first place") and *primo* ("firstly"). These are related Latin constructions but are distinct terms with distinct legal functions. *Prima facie* describes an evidentiary standard; *imprimis* signals priority or first listing in a document; *primus* as a placeholder name is a purely structural device in legal illustration. Anderson's entry cross-references *primary* and *imprimis* without distinguishing them carefully — a source of potential confusion when reading older dictionaries.
Why It Matters in Research
Researchers working with civil law materials, Roman law sources, or early common law texts influenced by the civil tradition will encounter *primus* frequently in hypothetical constructions drawn from the Digest and later commentators. Its function is purely illustrative — it signals the beginning of a fact pattern, not a legal rule or term of art. Mistaking it for a substantive term will derail analysis.
Two navigational traps are worth flagging. First, older English legal instruments occasionally use *primus* as a disambiguating suffix (John Smith primus, John Smith secundus), particularly in Scottish and Irish practice where multiple parties of the same name appear in the same deed or proceeding. This usage is structural, not honorific, and has nothing to do with rank or seniority. Second, the ecclesiastical meaning of *primus* — the presiding bishop of the Scottish Episcopal Church — occasionally surfaces in Scottish legal and testamentary records touching church property or appointments. Context will distinguish the two, but researchers should not assume the legal placeholder sense is the only one present in Scottish sources.
The Anderson's entry is unhelpful for this term, appearing as a fragment of a different entry (*false pretenses*) with only a passing cross-reference to *primary*. Burrill's is the operative source and is concise and accurate.
Historical Dictionary Support
Burrill's Law Dictionary provides the clearest legal definition: *primus* is a fictitious name used by Roman jurists alongside *secundus*, *tertius*, *quartus*, and others to populate illustrations, functioning like the modern alphabetical placeholder convention. Burrill correctly cites the Digest (D. 37.11.2.5) as an example source, grounding the term in its civil law context. This is reliable and sufficient for most research purposes.
Anderson's Dictionary of Law does not meaningfully treat *primus* as an independent entry. The appearance of the term in Anderson's is incidental — embedded in an entry on false pretenses — and the cross-references offered (*primary*, *imprimis*, *prima facie*) are accurate as far as they go but do not illuminate *primus* itself. Researchers should not rely on Anderson's here.
Neither source addresses the use of *primus* as a disambiguating suffix in English-language instruments, which developed as a practical scribal and drafting convention rather than a formally defined legal term. That usage is better traced through conveyancing practice manuals and Scottish legal form books than through general law dictionaries.
Jurisdictional Note
The placeholder use of *primus* is common to all legal systems drawing on Roman or civil law sources and appears in early English common law commentary for the same reason. The disambiguating suffix use (*John Smith primus*) appears most frequently in Scottish and Irish legal instruments. The ecclesiastical sense is specific to Scottish Episcopal Church governance and Scottish canon law contexts.