Definition
A Law French verb meaning to travel, journey, or go about on circuit. Eyrer describes the act of itinerating — moving from place to place to conduct judicial or official business. It is the verb form underlying the noun EYRE, which denotes the periodic circuit court system used in medieval England, and the noun EYRE itself derives from this root concept of judicial travel. The term appears in historical legal sources as shorthand for the itinerant function of royal justices commissioned to ride circuit through the counties of England.
Common Confusion
Eyrer is frequently encountered by researchers only in the vicinity of EYRE and EYRES (the courts themselves), and the two are sometimes conflated. Eyrer is strictly the verb — the act of going about — while Eyre names the institution or sitting that resulted from that travel. A justice would eyrer through a county; the court he held was an eyre. Burrill's citation to the Latin itinerare makes the functional equivalence plain: eyrer is simply the Law French rendering of the same concept expressed in Latin as itinerare, from which English derives "itinerant." Researchers should also distinguish eyrer from OYER, a superficially similar-sounding Law French term of entirely different meaning (to hear; as in oyer and terminer).
Why It Matters in Research
Eyrer is almost never a research destination in its own right — it is a navigational marker. When you encounter it in a medieval or early modern source, it signals proximity to material on the eyre system, itinerant justices, or the organization of royal judicial administration in pre-common-law England.
Several practical traps exist for corpus researchers:
First, spelling instability is severe. Historical sources render this term variously as eyrer, eirer, airer, and aller (the last reflecting confusion with the French aller, to go). Black's and Burrill's both spell it "eyrer" but cross-reference Britton (Britt. c. 2), a late-thirteenth-century law treatise written in Law French, which uses forms that do not always match the standardized dictionary headword. Any full-text search must account for these variants.
Second, the term's significance is almost entirely historical. By the time common law reporting developed into its mature form, the eyre system had already collapsed — the last general eyre was held in the early fourteenth century. Eyrer therefore appears in sources discussing medieval procedure, not in operative legal instruments or modern treatises. If you find the term in a document, the document is either medieval, a translation or digest of medieval sources, or a historical commentary.
Third, the Bouvier entry under "Eyrer" is structurally misleading. Bouvier runs the definition of eyrer into a string of unrelated F-headed entries (the letter F as a branding mark, F.O.B.), a product of alphabetical dictionary formatting that can confuse researchers scanning the page. The eyrer definition is complete at "See EYRE."
Historical Dictionary Support
All four source dictionaries agree on the core definition without meaningful divergence: eyrer means to travel or go about on circuit, derived from Law French and equivalent in sense to the Latin itinerare. Black's (both editions) and Burrill cite Britton, chapter 2, as authority — a sensible reference given Britton's role as one of the foundational texts for the eyre system.
Burrill adds the explicit Latin parallel (itinerare), which is useful for researchers working across Latin and Law French sources simultaneously. Bouvier's entry is the thinnest of the four, offering a cross-reference to EYRE rather than independent elaboration.
No source develops the procedural context of what eyrer entailed in practice — how justices in eyre were commissioned, what jurisdiction they exercised, or how the circuits were organized. For that material, the historical dictionaries are inadequate starting points; researchers must go to primary sources such as Britton, Bracton, or Fleta, or to secondary histories of English legal institutions.
Jurisdictional Note
Eyrer is an institution of English law with no direct American counterpart. Colonial American law adapted English circuit-riding practice but under entirely different nomenclature and constitutional structure. The term does not appear in American statutory or case law.