Definition
A Latin writ directing the formal association of certain lay persons — specifically knights and other gentlemen of the county — with the justices of assize during their circuit. The writ functioned as an instrument of appointment, formally admitting qualified laymen to sit alongside professional judges in the exercise of judicial or quasi-judicial functions at the assizes. The name translates roughly as "for admitting into fellowship" or "for admitting as a companion."
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Why It Matters in Research
This is a term of narrow historical relevance, appearing primarily in pre-modern English common law materials. Researchers will encounter it almost exclusively in treatises and registers from the period when the assize system was active in England — roughly the 13th through 19th centuries. It has no modern procedural counterpart in either English or American law.
For corpus researchers, the principal trap is treating this writ in isolation without understanding the broader assize system. The writ makes no sense apart from the Commissions of Assize and the structure of circuit justice in medieval and early modern England. Searching for the term in later sources will yield little; it effectively disappears from active legal usage as the assize courts were consolidated and eventually abolished by the Judicature Acts of 1873–1875.
The term also illustrates a broader category of Latin writs whose names describe their operational function — "admittendo" (admitting) and "socium" (companion or associate) — which is useful context when navigating registers of original writs. Researchers working through Registrum Omnium Brevium and similar writ registers will find this term alongside comparable administrative writs of the same era.
There is no meaningful American law counterpart. The writ was not transplanted into colonial or post-independence American legal practice in any recognized form.
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Historical Dictionary Support
Black's Law Dictionary (2nd Ed.) provides the sole historical dictionary entry for this term, defining it as a writ for associating knights and other gentlemen of the county with justices of assize on circuit, with a reference to Reg. Orig. 206 — the Registrum Omnium Brevium, the standard register of original writs. Black's treatment is minimal, which accurately reflects the term's limited footprint even in historical legal literature. No expansion or disagreement among other major historical dictionaries is available from the present sources.
The brevity of Black's entry is itself informative: by the time the 2nd edition was compiled, the writ had long been obsolete, and its inclusion reflects the dictionary's function as a historical reference tool rather than a guide to live practice. Researchers should treat Black's entry as a starting point for locating the writ in original registers, not as a complete account of its procedural operation.
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Jurisdictional Note
This writ is exclusively a product of English common law and applies only in the historical context of the English assize system. It has no recognized counterpart in Scottish, Irish, or American law, and it ceased to have any practical application following the restructuring of English courts in the latter half of the 19th century.
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