Definition
A trithing was a territorial division of a county in Anglo-Saxon and early English law, constituting one-third of a county and comprising three or more hundreds. The term describes both the geographic unit itself and, by extension, the local court convened within it. Three related offices and institutions attached to the trithing:
(1) The trithing-mote (or trith-mote): the court held for the trithing, resembling a court-leet in form but ranked below the county court in authority.
(2) The trithing-reeve: the administrative officer responsible for superintending the trithing.
(3) The trithing-man: a local officer associated with the trithing, sometimes equated with a constable.
The trithing is the historical predecessor to the modern "riding," a term that survives today primarily in the context of the traditional ridings of Yorkshire.
Common Language
Modern common usage (Wiktionary): A riding — one of three ancient divisions of a county in England.
Historical common usage (Webster's 1913): One of three ancient divisions of a county in England, now called riding.
The common usage here tracks the legal meaning closely, but with an important shift in terminology. "Trithing" is the archaic legal form; "riding" is the anglicized contraction that displaced it. Researchers encountering "riding" in later sources and "trithing" in earlier ones are reading the same institution under different names. The legal dictionaries preserve "trithing" as the term of art for the Saxon-era form precisely to maintain that historical distinction.
Common Confusion
Trithing and tithing are easily conflated, and the confusion has a documented medieval pedigree. Burrill notes that the trithing mentioned in Magna Carta (c. 36) appears to have been intended for tithing — a much smaller unit of ten households. The resemblance in spelling and the compression of Latin manuscript forms made the error persistent. Researchers working with early charter and statutory sources should treat any reference to "trithing" in the Magna Carta context with particular skepticism and consult Coke's Second Institutes, where this point is addressed directly.
Why It Matters in Research
This is an almost purely historical term. No modern jurisdiction uses "trithing" as an operative legal category; its relevance is confined to Anglo-Saxon administrative history, the history of English local government, and the interpretation of early English legal instruments.
Several research traps deserve attention:
Spelling variation is severe. Latin forms include trithinga, trithingus, and tritingum; the anglicized form "riding" appears from at least the medieval period onward. Searches limited to any single spelling will miss substantial portions of the corpus. Burrill's Latinized headword "Triding" reflects a common variant that Black's does not lead with.
The Magna Carta ambiguity noted by Coke means that some early commentators used "trithing" and "tithing" interchangeably in glossing that document. Researchers working on Magna Carta scholarship must distinguish the administrative unit (trithing) from the frankpledge unit (tithing), which are entirely different institutions.
The trithing-mote is the jurisdictional bridge between this term and the broader history of English court structure. Researchers tracing the descent of local court jurisdiction — from the Saxon period through the abolition of courts-leet — should map the trithing-mote as an intermediate layer between the hundred court and the county court.
Yorkshire is the primary surviving instance. The three ridings of Yorkshire (North, East, and West) preserved the trithing structure in functional administrative form well into the twentieth century, making Yorkshire-specific legal and governmental records a direct continuation of the Saxon framework.
Historical Dictionary Support
The four source dictionaries are in close agreement on the core definition: a trithing is one-third of a county, comprising three or more hundreds, with an associated court and administrative officer. Black's first and second editions are nearly identical in their treatment. Burrill adds the most scholarly apparatus, citing Blackstone's Commentaries (1 Bl. Com. 116), Spelman, Cowell, and Fleta, and is the only source to flag the Magna Carta ambiguity explicitly.
Rapalje & Lawrence's entry is the most compressed and introduces the equation of "trithing-man" with constable — a detail the other dictionaries omit. This constable identification suggests that the trithing-man had a law enforcement dimension that the purely administrative framing in Black's does not capture.
None of the historical dictionaries address the term's obsolescence directly or situate it within the broader collapse of Saxon administrative geography after the Norman Conquest — a gap that Blackstone's Commentaries fills more adequately than any of the law dictionaries in the corpus.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Saxon Law; Hundred (Administrative Division); Courts-Leet; Riding (Yorkshire)