Definition
Agistamentum is a medieval Latin legal term with two related but distinct meanings in old English law.
1. The practice or arrangement of agistment — the feeding or pasturing of cattle, particularly within the king's forests. In this sense, agistamentum referred to the organized system by which animals were received onto forest land and pastured there, typically for a fee paid to the Crown or its officers.
2. A duty or tax levied upon landowners for the repair and maintenance of banks, dykes, or sea walls, assessed in proportion to the benefit those landowners received from the protective works. This usage applied chiefly in low-lying coastal and fenland areas where drainage infrastructure was shared across multiple estates.
The term derives from the verb agistare (to agist), and its English common-law descendant is the noun agistment, which remained in active legal use well into the modern period.
Why It Matters in Research
Researchers will encounter agistamentum almost exclusively in medieval and early modern sources — forest law records, manorial documents, fenland drainage proceedings, and the treatise literature of the thirteenth through seventeenth centuries. The Latin form is the version found in Fleta, Spelman, and Cowell; by the seventeenth century, English legal writers had largely shifted to the anglicized agistment, though the Latin form persisted in learned citation.
Two research traps arise from the dual meaning. First, the same term covers both a private contractual relationship (the pasturing arrangement between a landowner and the owner of cattle) and a quasi-fiscal public obligation (the drainage levy). Sources from forest law proceedings use the term in the first sense; fenland drainage records use it in the second. Context is essential, and a researcher who assumes one meaning throughout a document may badly misread the other occurrences.
Second, agistamentum in the forest law context connects directly to the offices of the agistator (the royal officer responsible for managing agistment in the king's forests) and to presentments made in the forest courts. The Fleta citation (lib. 2, c. 41) places the term within the forest administration of the late thirteenth century, and researchers working on Crown forest records should treat agistamentum as an entry point into that broader administrative vocabulary — agistator, regard, puture, cheminage, and related forest charges.
For drainage levy research, the term connects to the history of commissioners of sewers and the legislation governing fen drainage, where proportionate contribution obligations on adjacent landowners were a persistent theme from the medieval period through the drainage statutes of the seventeenth century. The Spelman and Cowell references place agistamentum alongside the administrative vocabulary of that tradition.
Historical Dictionary Support
Burrill's Law Dictionary is the primary source available here and provides a workable synthesis. Burrill correctly identifies both meanings and cites the relevant authorities: Fleta for the forest agistment, and Spelman (glossary entry for Agistare) and Cowell's Interpreter for the drainage levy sense. These citations are consistent with the term's actual usage in those sources.
Burrill's entry is compact and accurate but does not elaborate on the procedural context of either meaning. It treats agistamentum as a vocabulary item rather than tracing its role in the forest court system or the drainage levy machinery. Researchers relying on Burrill alone will know what the word means but will need to consult Fleta directly and Spelman's Glossarium more fully to understand how agistamentum functioned operationally. Cowell's Interpreter, cited for the drainage sense, is worth consulting for its seventeenth-century legal perspective, though Cowell's definitions are sometimes imprecise by modern standards.
No significant divergence among the historical dictionaries is apparent here, as Burrill is the sole source provided. The consensus of the broader secondary literature on forest law and fenland drainage supports the dual meaning Burrill records.
Jurisdictional Note
Agistamentum is a term of English law specifically. The forest law usage is tied to the Crown's forest administration in England, and the drainage levy usage to the particular geography and legal institutions of the English fens and coastal lowlands. Researchers working in Scottish, Irish, or Welsh records should not assume the term carries the same institutional meaning even where it appears.