Definition
TRIENS (Latin). A term carrying two distinct meanings across Roman and feudal law contexts.
1. Roman law — monetary unit and coin. A subdivision of the as, representing four unciae, or four-twelfths of the whole — that is, one-third. As a coin, the triens was a copper (or bronze) piece equal in value to one-third of the as. The as itself was the foundational unit of Roman reckoning, whether of weight, currency, or inheritance fractions, and the triens was one of its standard fractional divisions.
2. Feudal law — dower or third. In the context of English feudal law, triens denotes a widow's dower right: her entitlement to a one-third share of her deceased husband's lands. The term reflects the Latin origin of the common law dower concept and appears in historical treatises and Bracton-era legal writing as a direct synonym for the widow's third.
Common Language
Modern common usage (Wiktionary): A bronze coin minted during the Roman Republic, valued at 4 unciae.
Historical common usage (Webster's 1913): A Roman copper coin equal to one-third of the as.
Both common definitions capture only the monetary sense of the term. The legal significance of triens in feudal contexts — as a technical term for dower, describing a widow's legal right to land rather than any coin or commercial transaction — is entirely absent from the common definitions. A researcher encountering triens in an English feudal or ecclesiastical source should not assume the monetary reading is intended.
Common Confusion
Triens and dower are functional synonyms in medieval legal Latin, but they are not always interchangeable in research. Dower is the operative English common law term that survived into modern practice; triens is the Latin antecedent that appears in earlier sources and in Romanist-influenced writing. Conflating the two is harmless in most contexts, but researchers should recognize that triens in a Roman law source means something numerically precise (four-twelfths of the as) and carries no property-law connotation, while the same word in a feudal source signals the widow's land entitlement. The fractional value — one-third — is what connects the two usages, but the legal systems they belong to are entirely different.
Why It Matters in Research
The dual context of this term is the primary navigational hazard. A researcher working in Roman law sources will encounter triens in discussions of inheritance fractions, coin valuation, and the arithmetic of the as system. A researcher working in early English common law or Bracton-influenced texts will encounter the same word in property and dower discussions. Without recognizing which tradition the source belongs to, the meaning can be badly misread.
The feudal usage is the more consequential for common law research. Dower — the widow's third — was a major subject of medieval property law, and sources that use triens to describe it are drawing on Roman fractional terminology to name an English legal right. Blackstone's Commentaries, which all three source dictionaries cite (2 Bl. Comm. 129 for the feudal sense; 2 Bl. Comm. 462, note m for the Roman sense), provides the clearest bridge between the two usages and is the recommended starting point for researchers who need to situate the term.
Because triens does not survive as a term of art in modern Anglo-American law, it will not appear in current statutory or case law. It is a term of historical and comparative research. Researchers using digitized historical corpora should note that OCR errors may render unciae, unciæ, or the abbreviation for Blackstone's Commentaries inconsistently across editions.
Historical Dictionary Support
Black's (1st Ed.), Black's (2nd Ed.), and Burrill's are in close agreement, all providing both the Roman and feudal definitions and citing the same Blackstone passages. The 2nd edition of Black's introduces a minor OCR artifact in the source material ("Im" for "In," "uncic" for "unciae") but is substantively identical. Burrill adds a citation to Taylor's Civil Law (Tayl. Civ. Law, 492) for the Roman subdivision sense, providing a secondary treatise anchor not present in Black's.
None of the three historical dictionaries elaborate on the feudal usage beyond the bare equation of triens with dower or third. They do not discuss how the term appears in specific medieval instruments, plea rolls, or writs, which limits their utility for documentary research. For deeper treatment of the dower concept itself, researchers must move to entries under DOWER in these same dictionaries or to primary sources such as Bracton's De Legibus et Consuetudinibus Angliae.
The Webster's and Wiktionary definitions, while accurate for the coin, confirm that common usage never absorbed the feudal legal sense — further evidence that this is a term whose meaning is entirely context-dependent.
Jurisdictional Note
The Roman law sense of triens has no jurisdictional home in modern common law systems. The feudal dower sense was part of English common law and migrated to American colonial and early state law, but the Latin term itself was not carried forward into American practice. Civil law jurisdictions drawing on Roman sources may use triens or its cognates in historical scholarship but not in operative legal texts.