Definition
ESCU (also escue; Law French, from Latin scutum, meaning shield) carries two distinct historical legal meanings:
1. A shield or buckler, specifically as a physical instrument in the medieval judicial proceeding known as trial by battle. The term designated the particular form of shield — un escu de iiii corners, a square buckler — prescribed for use by the combatants in that mode of proof.
2. A pecuniary payment made in lieu of military or feudal service. In this sense, escu functions as a synonym for scutage: a monetary commutation by which a tenant owing knight service to a lord discharged that obligation by payment rather than personal military appearance.
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Common Language
Modern common usage (Wiktionary): "Écu" in modern English and French refers primarily to a historical French coin of varying denominations, or loosely to a heraldic shield.
Historical common usage (Webster's 1913): Webster does not carry a distinct legal entry for escu, though écu appears as a French coin and as a heraldic term for a shield-shaped charge on a coat of arms.
The gap between the common and legal meanings is historically significant. The ordinary English speaker encountering écu or escu in a historical document would likely read it as a coin or a heraldic device. In legal records and pleadings, however, the term operates in two more specific registers: as a named piece of equipment with prescribed dimensions governing the conduct of judicial combat, and as shorthand for a feudal fiscal obligation. Neither of these readings is accessible from the coin or heraldry sense alone.
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Recognized Forms
/ SUBTYPES
Un escu de iiii corners: The square buckler specifically prescribed for trial by battle. Britt. c. 22 (Britton) identifies this as the designated form of shield for judicial combatants, distinguishing it from round or other shaped shields used in other martial contexts.
Escu as scutage: The commutation payment sense, representing the monetary value assigned to a unit of knight service. This usage overlaps substantially with the broader scutage doctrine and with the term escuage.
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Why It Matters in Research
Researchers working in medieval English or Anglo-Norman legal records will encounter escu in contexts where its meaning is not immediately self-evident, and where misreading it as a coin reference could corrupt analysis of a pleading or chronicle entry.
In trial-by-battle records, the physical description of the escu de iiii corners is procedurally meaningful: the shape and dimensions of the shield were regulated, and deviations could affect the validity of the combat. Britton (Britt. c. 22) is the primary authority here, and researchers should treat any citation to Britton on this point as governing the procedural rather than heraldic sense of the term.
In feudal tenure records, the payment sense connects escu directly to the scutage literature. A researcher tracing a lord's income from knight service, or a tenant's effort to discharge a military obligation, may find escu used interchangeably with escuage or scutage depending on the language register of the document (Latin, Law French, or Middle English). Cross-checking the payment sense against scutage records and pipe rolls is advisable.
The Burrill entry references both Britton (c. 22) and what appears to be a Michigan Reports citation alongside a Georgia entry, suggesting the term surfaced in American common law litigation involving historical feudal concepts or title disputes drawing on English land tenure history. Researchers in early American property law should be alert to this carry-forward.
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Historical Dictionary Support
Burrill's Law Dictionary is the primary source carrying this term in the English-language legal dictionary tradition, and its entry is characteristically compressed. Burrill correctly identifies both meanings — the shield/buckler and the pecuniary payment — and supplies the Britton citation for the trial-by-battle sense. The entry is incomplete as printed (the Georgia and Michigan citations appear truncated), which limits the ability to trace the American case law dimension without independent verification.
Bouvier's Law Dictionary and Black's Law Dictionary do not carry a distinct entry for escu as such, folding the relevant doctrine into escuage and scutage. This means that researchers relying solely on Bouvier or Black will miss the specific trial-by-battle usage and the procedural significance of the square buckler form.
No modern legal dictionary appears to carry the term, reflecting the complete obsolescence of trial by battle as a legal institution and the absorption of scutage doctrine into historical legal scholarship rather than active practice.
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Jurisdictional Note
Escu as a live legal term belongs entirely to the medieval English common law and Anglo-Norman documentary tradition. Its appearance in American legal sources is vestigial — arising in title disputes, historical pleading questions, or academic treatments of feudal tenure — rather than reflecting any independent American legal development of the concept.
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