Definition
A Latin term of medieval European law with several related but distinct meanings depending on context and period:
1. An edict, statute, or public ordinance — the formal exercise of sovereign or delegated authority to command or prohibit. In this sense, bannum is the instrument by which rulers established legal obligations, including public works requirements and tribute obligations.
2. A fine or monetary penalty — bannum solvat means "he shall pay a ban," indicating the sum owed as consequence for a breach of law or ordinance.
3. A tribute or exaction — in Carolingian sources, a levy imposed by royal authority on persons or communities.
4. Banishment — exclusion from a territory or community as a formal legal sanction. This is the meaning most directly ancestral to the modern English term "ban" in its legal sense.
Black's Law Dictionary (both editions) treats bannum as a simple cross-reference to ban. Burrill's Law Dictionary provides the substantive treatment, drawing on Spelman's Glossarium and Carolingian capitularies to distinguish the term's multiple functions in early medieval legal texts.
Common Language
Modern common usage (Wiktionary): A synonym of ban, defined as "a gathering for war" or "a mulct or penalty."
Historical common usage (Webster's 1913): Webster's does not separately define bannum; the term belongs to specialized legal-Latin vocabulary rather than general English.
Editorial note: The modern English word "ban" has narrowed considerably from its medieval Latin ancestor. Today ban most commonly means a prohibition or interdiction — the act of forbidding something. Bannum in the sources encompasses that meaning but also reaches well beyond it to cover the fine imposed for breach of a ban, the sovereign authority itself that issues such commands, a tribute, and outright banishment. A researcher who reads bannum and substitutes the modern sense of ban risks missing the fiscal and constitutional dimensions that appear frequently in Carolingian and Lombard materials.
Common Confusion
Bannum is sometimes conflated with bannus, bannitus, and banleuca, which are related but not interchangeable. Bannus tends to appear in ecclesiastical and feudal sources as the power of command or jurisdiction itself, distinct from any specific edict. Bannitus is the person placed under a ban — the banished or outlawed individual — not the act or instrument. Banleuca denotes a territorial league or district subject to a particular ban or jurisdiction. Medieval scribes used these forms with some inconsistency, and the distinction between the sovereign power (bannus), its formal expression (bannum), the subject of that power (bannitus), and the territory over which it runs (banleuca) is one researchers must reconstruct from context.
Why It Matters in Research
Bannum appears almost exclusively in pre-Norman and early medieval European legal sources — Lombard law, Frankish capitularies, Anglo-Saxon texts transmitted through later Latin glosses, and the secondary scholarship (particularly Spelman) that systematized them in the seventeenth and eighteenth centuries. Researchers will not find bannum operative in English common law reports or in American materials; its relevance is to comparative legal history, canon law background research, and the origins of Anglo-Saxon public law concepts.
The multiplicity of meanings creates real interpretive hazard. In a single Carolingian capitulary, bannum may appear first as the sovereign's authority to command, then as the specific ordinance issued, and then as the fine for noncompliance — three distinct legal phenomena sharing one word. Burrill's synthesis is the most useful English-language guide to this range, though it should be checked against primary Carolingian scholarship for accuracy.
Because Black's (both editions) merely cross-references to ban, researchers relying solely on Black's will miss the fiscal and territorial dimensions of the term. Burrill is essential for this entry.
For researchers tracing the history of banishment as a legal sanction, bannum provides the conceptual and terminological root connecting Roman relegatio and deportatio to medieval exclusion practices and, eventually, to transportation and exile in early modern English law.
Historical Dictionary Support
Burrill's Law Dictionary is the primary substantive source. Burrill draws on Spelman's Glossarium Archaiologicum and the Carolingian capitularies directly, and his four-part breakdown — edict, fine, tribute, banishment — tracks the actual range of usage in the sources with reasonable fidelity. His citation to Esprit des Lois (Montesquieu, Book 30, Chapter 20) is a useful pointer for researchers interested in the constitutional theory surrounding Frankish public power.
Black's Law Dictionary (both editions) offers nothing beyond a cross-reference. This is not unusual for highly specialized Latin terms in Black's, which often deferred to sources like Spelman and Cowell rather than providing independent treatment.
The Wiktionary synthesis — "gathering for war" or "mulct or penalty" — captures two real senses but omits the ordinance and tribute meanings and somewhat understates the term's constitutional significance in Carolingian governance.
No historical dictionary in the standard common law tradition (Cowell's Interpreter, Jacob's Law Dictionary, Tomlin's) provides a materially fuller treatment than Burrill. The deepest scholarship on bannum sits outside the Anglo-American legal dictionary tradition entirely, in continental medievalist historiography.