Definition
A gallon measure. Jalonata is a Latin term appearing in medieval English legal texts to denote a unit of liquid capacity equivalent to a gallon. It surfaces in records and pleadings concerned with the measurement of liquids — most commonly ale, wine, or other commodities sold or regulated by volume. The term belongs to the specialized vocabulary of old English weights and measures law, where standardization of units was a recurring subject of royal regulation and local custom.
Why It Matters in Research
Researchers encountering jalonata in manuscript records, plea rolls, or early English statutory materials should treat it as a direct equivalent of the gallon measure, not as a distinct or independently defined unit. The practical challenge is that the gallon itself was not uniform across medieval England: ale gallons, wine gallons, and corn gallons differed in capacity, and the specific commodity context of the document will determine which gallon is intended. A reference to jalonata in a brewing or assize record carries different volumetric content than the same term appearing in a wine merchant's account. Do not assume a single fixed quantity without checking the commodity and the relevant assize or statute governing that trade at the time.
The term appears in Fleta (lib. 2, c. 12, § 1), a late thirteenth-century legal treatise closely associated with Bracton's tradition. Fleta is a key source for understanding administrative and commercial regulation in Edwardian England, and researchers working with that text will find jalonata embedded in passages dealing with the assize of measures. Because Fleta is written in scholastic Latin with heavy reliance on technical legal vocabulary, a working knowledge of Latin measurement terms is essential for accurate reading.
This term will rarely appear outside of highly specialized historical legal research — primarily in the context of medieval English commercial regulation, assizes of weights and measures, or disputes involving the sale of regulated commodities. Researchers in modern legal practice will not encounter it. Its value is almost entirely documentary and interpretive.
Historical Dictionary Support
Burrill's Law Dictionary provides the core entry: "L. Lat. In old English law. A gallon measure. Fleta, lib. 2, c. 12, § 1." The entry is brief and unambiguous, directing the reader to Fleta as the primary textual authority. Burrill does not attempt to quantify the measure precisely or distinguish among the variant gallon types, which is a meaningful gap for researchers who need to reconstruct actual volumetric quantities from historical records.
No broader synthesis across multiple historical legal dictionaries is possible from the available sources, as jalonata appears to be recorded in Burrill without counterpart entries in the other standard historical dictionaries. The Fleta citation itself is the most reliable anchor for further research. Cowell's Interpreter and Blount's Nomo-Lexicon, which Burrill cites for related terms in the same entry cluster (notably jampnum/jaunum), do not appear to address jalonata independently, suggesting the term had limited circulation even in historical legal reference literature.
Jurisdictional Note
Jalonata is specific to old English law. It has no recognized equivalent or usage in Scottish, Irish, or continental legal systems. Research utility is confined to medieval English sources.