Definition
A glaive is a medieval edged weapon — historically described as a sword, lance, or horseman's staff — recognized in English common law as one of the permitted weapons in trial by combat. Its legal significance is almost entirely confined to the procedural law of wager of battle: when a defendant or appellant elected to settle a dispute by personal combat, the glaive was among the weapons the law sanctioned for use. Outside of that context, the term carries no independent legal meaning.
Common Language
Modern common usage (Wiktionary): A pole weapon with a large blade fixed at the end, edge on the outside curve; also a light lance or, loosely, a sword.
Historical common usage (Webster's 1913): A weapon with a large blade on a pole, edge on the outside curve; also a light lance with a long sharp-pointed head; used poetically to mean sword generally.
The gap between common and legal usage here is narrow but worth noting. In ordinary and literary language, glaive describes a specific class of pole-arm or is used loosely for any sword. In the legal sources, it appears almost exclusively as a term of art within the procedural framework of trial by combat, where its precise physical form mattered less than its status as a lawful weapon for that proceeding. The legal dictionaries do not attempt to resolve the weapon's exact design — they list sword, lance, and horseman's staff interchangeably — reflecting that the law's interest was categorical permission, not arms specification.
Why It Matters in Research
Researchers will encounter glaive almost exclusively in historical sources dealing with wager of battle and the law of appeals of felony. It does not appear as a live legal term in modern practice; its presence in Black's Law Dictionary (both editions) is archival rather than operative.
Key research considerations:
The term signals proximity to trial by combat materials. If glaive appears in a historical source, the surrounding text almost certainly concerns wager of battle, appeals of felony, or the abolition of those procedures. In England, trial by combat was not formally abolished until 1819 (59 Geo. III c. 46), meaning sources from any period before that date may treat it as living law.
Black's treatment is identical across the first and second editions, word for word. This uniformity suggests the editors treated the term as a fixed historical artifact requiring no updated gloss — which is itself informative about the term's status.
The weapons list matters for research into the formalities of combat. Historical sources on wager of battle specified permitted weapons with some precision, because improper arms could affect the validity of the proceeding. Glaive, baculum (staff or baton), and shield appear across various accounts of the combat ritual. Researchers tracing the procedural rules of trial by combat should treat the weapons terminology as a connected cluster, not isolated entries.
Do not expect consistency across historical sources on the weapon's physical description. Legal dictionaries borrowed loosely from military and literary vocabulary, and the same word might describe a pole-arm in one source and a sword in another. For legal research purposes, the definitional precision is in the procedural category (permitted combat weapon), not the physical description.
Historical Dictionary Support
Black's Law Dictionary (1st and 2nd editions) agree entirely: a sword, lance, or horseman's staff; one of the weapons allowed in trial by combat. The brevity of both entries reflects the term's status — it is a relic preserved for completeness, not a term requiring doctrinal elaboration.
What the historical dictionaries do not address: neither edition explains the procedural rules governing weapon selection in trial by combat, the distinction between weapons permitted in civil versus criminal appeals, or the historical trajectory toward abolition. Researchers seeking that context must look beyond the dictionary entries to treatises on the law of arms and early procedural history.
Webster's 1913 is more physically descriptive than the legal dictionaries, which is characteristic of the divergence between lexicographical and legal approaches to weapons terminology. The legal dictionaries were not concerned with accurate arms history; they were preserving the vocabulary of a defunct procedure.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Trial by Combat; Wager of Battle; Appeals of Felony.