Definition
Libra numerata is a Latin legal phrase meaning "a pound counted" — that is, a sum of money reckoned by tale (by counting individual coins) rather than by weight. In medieval English monetary practice, payment could be rendered in one of two ways: by counting out a specified number of coins to reach a nominal pound value, or by weighing coins to verify their actual silver content. Libra numerata denotes the former method.
The phrase contrasts directly with libra pensa (or libra pensata), meaning "a pound weighed," and with libra arsa, a pound tested by fire (assayed). Together, these three terms reflect a system in which the reliability of coined money was not assumed but verified — whether by count, scale, or furnace.
Common Confusion
LIBRA NUMERATA / LIBRA PENSA / LIBRA ARSA: These three phrases are easily collapsed into a single undifferentiated idea of "payment in pounds," but they represent meaningfully distinct standards of monetary obligation. Libra numerata imposes the lowest burden of verification — the creditor accepts coins at face value by count alone. Libra pensa requires weighing, guarding against clipped or underweight coins. Libra arsa adds assay by fire, the most exacting standard, ensuring the metal's purity. The distinction mattered in medieval legal instruments because a debt instrument specifying one mode of payment could not be discharged by tender under a different mode without the creditor's agreement. Researchers encountering these phrases in medieval charters or plea rolls should treat them as operative terms, not decorative Latin.
Why It Matters in Research
This term belongs to the specialized vocabulary of medieval English monetary law and appears almost exclusively in documents from the pre-modern period — charters, exchequer records, plea rolls, and treatises on Anglo-Saxon and Norman financial practice. Researchers will not encounter it in post-medieval legal materials except as a historical reference.
The practical significance in archival research is this: when a medieval instrument specifies libra numerata, it signals that the parties agreed to a nominal rather than intrinsic standard of value. This has interpretive consequences when assessing the enforceability or equivalence of payments recorded in different documents from the same period, since a debt recorded as libra numerata may represent a different actual quantity of silver than one recorded as libra pensa, even if both state the same nominal pound amount.
Because coin clipping, wear, and debasement were persistent problems in medieval England, the choice of payment standard was not a formality. Legal disputes over whether a debt had been properly tendered could turn on which standard the original instrument specified. Researchers working in the history of English contract law, property conveyancing, or exchequer practice will find this term relevant to understanding how monetary obligations were constructed and enforced.
The Law Mind corpus is likely to surface libra numerata in treatises on English legal antiquities and in glossaries appended to editions of early English statutes or Year Books. It does not appear in modern legal doctrine and carries no current operative legal meaning in any common law jurisdiction.
Historical Dictionary Support
Both Black's and Burrill's trace to a single source: Spelman's Glossarium Archaeologicum, the authoritative early modern glossary of Anglo-Latin legal and historical terms. Neither dictionary elaborates beyond a sentence, and neither distinguishes the practical legal consequences of the different payment modes in any depth.
Burrill's is the more useful of the two for this term, because it places libra numerata in explicit contrast with libra pensa (a pound weighed) and cross-references libra arsa within the same entry cluster. This juxtaposition, absent from Black's compressed version, is the key to understanding the term's meaning. A researcher relying only on Black's would see only half the picture.
Neither source addresses the documentary contexts in which these terms appear, the procedural consequences of specifying one mode over another, or the exchequer practice that gave rise to the distinctions. For deeper treatment, researchers should consult Spelman directly or look to specialized scholarship on medieval English monetary history and the history of the English exchequer.
Jurisdictional Note
Libra numerata has no operative legal meaning in any modern jurisdiction. Its relevance is confined to English legal history, particularly the Anglo-Norman and medieval periods. Researchers working in Scottish, Irish, or continental European legal history may encounter analogous monetary distinctions in their own archival traditions, but the specific Latin phrase and its English legal context belong to the English common law heritage.