Definition
Under horn is an archaic term describing the practice of allowing bulls, cows, and other horned cattle to graze together without separation on a common pasture. The phrase captures a specific feature of common land use in English agrarian law: that animals of different owners, and of both sexes, ran together in the same undivided grazing space rather than being kept in separate enclosures or herds.
The term does not describe a legal right in itself but rather characterizes a condition of common grazing — specifically, the promiscuous or commingled running of horned beasts. Its significance was practical as much as legal: the mixing of animals on shared land created questions about liability for damage caused by bulls, responsibility for offspring, and the scope of each commoner's grazing entitlement.
Why It Matters in Research
Researchers will encounter this term almost exclusively in historical sources dealing with English common field systems and rights of common, particularly common of pasture. It is a term of agricultural description embedded in the law of commons rather than a term of art with a precise doctrinal definition.
If you find "under horn" in a historical deed, manor court record, or treatise on commons, read it as a signal that the document is addressing conditions of shared grazing rather than a standalone legal concept. The phrase helps characterize the nature of the right being granted or disputed — whether animals were to be controlled, separated, or allowed to run freely with others.
The term is nearly absent from American legal sources. It belongs squarely to English manorial and agrarian law, which largely did not transplant to the American colonies in the form of open-field common grazing. Researchers working in American property law will have no occasion to use it; researchers working in English legal history, land tenure, or the history of commons will find it a useful contextual marker.
Cross-referencing to Spelman's Glossary (the authority Black's cites) is worthwhile for researchers pursuing the historical depth of this term. Henry Spelman's Glossarium Archaiologicum is a seventeenth-century work on legal and historical terms, and his treatment of under horn situates it within the broader vocabulary of English agrarian custom.
Historical Dictionary Support
Black's Law Dictionary provides the sole historical legal dictionary entry recovered, and it is brief: "the promiscuous feeding of bulls and cows or all horned beasts that are allowed to run together upon the same common," with attribution to Spelman. The entry is definitional rather than analytical, offering no commentary on legal disputes, no discussion of how courts construed the condition, and no cross-references to related doctrine.
What historical sources do not provide is any developed body of case law or statutory treatment keyed specifically to the phrase "under horn." The term functions as descriptive vocabulary within the law of common of pasture rather than as a trigger for a distinct legal test or remedy. A researcher should not expect to find judicial opinions parsing "under horn" as a term of art; its value is contextual.
Jurisdictional Note
Under horn is a term of English agrarian and manorial law with no meaningful presence in American, Canadian, or other common law jurisdictions. Its use is confined to historical sources originating in England and to scholarship analyzing English land tenure and common field systems.