Definition
A certificate of assize was a writ in English practice by which a matter previously determined by an assize before justices could be re-examined or retried. It functioned as a mechanism for reviewing the verdict or findings of an assize proceeding — essentially an early form of appellate or corrective process directed at the assize itself. The writ is entirely obsolete and belongs exclusively to the historical record of English common law procedure.
Common Confusion
The certificate of assize should not be confused with modern certificates issued by courts, administrative bodies, or regulatory agencies — such as certificates of need, certificates of occupancy, or certification marks. Those are unrelated instruments. Nor should it be confused with the writ of attaint, which was another historical mechanism for challenging a jury verdict on grounds that jurors had sworn falsely, or with the writ of error, which became the dominant appellate vehicle in later common law practice. The certificate of assize was specific to the assize proceeding and had no lasting successor.
Why It Matters in Research
This term will appear only in historical English legal materials — primarily in treatises, abridgments, and year books predating the nineteenth century. Researchers encountering it should treat it as a marker of the period when the assize system was the principal mode of royal justice in England, roughly from the twelfth through the seventeenth centuries.
Several traps await the unwary researcher. First, the word "certificate" in historical legal sources carries procedural weight that differs entirely from its modern administrative meaning. A researcher searching for "certificate" in a historical corpus may surface this writ alongside wholly unrelated instruments. Second, the assize system itself underwent significant transformation over time: the term "assize" referred variously to the proceeding, the court, the jury, and the legislation establishing particular forms of action. A certificate of assize presupposes familiarity with which assize is meant in context. Third, Bouvier notes the writ is "entirely obsolete," but that note was written in the nineteenth century — meaning researchers working with materials from the seventeenth or eighteenth century may encounter the writ as still nominally operative, even if rarely invoked.
The writ is most likely to surface in: Fitzherbert's Natura Brevium (cited by Bouvier as authority for the writ's form), Blackstone's Commentaries Book III, and Comyns' Digest under the Assize heading. These are the core primary and secondary sources for this instrument.
For corpus researchers using the Law Mind platform, the certificate of assize connects most naturally to materials on English common law civil procedure, the development of appellate review, and the history of the assize courts. It is not a term that will appear in American legal sources except as a historical reference.
Historical Dictionary Support
Bouvier's Law Dictionary provides the only entry in the source material. Bouvier defines it concisely as a writ for the "re-examination or retrial of a matter passed by assize before justices," citing Fitzherbert's Natura Brevium and Blackstone's Commentaries (Book III, page 389). He adds without elaboration that it is "now entirely obsolete."
Bouvier's entry is accurate but sparse. It captures the procedural function of the writ without explaining the broader context of why such re-examination was needed or how it related to other corrective writs of the period. Blackstone's treatment, to which Bouvier directs the reader, provides fuller context: by Blackstone's time the certificate of assize had given way to more developed appellate mechanisms, and Blackstone discusses it primarily as a historical artifact. Comyns' Digest, also cited by Bouvier, collects the relevant authorities under the Assize heading and is the most granular source for the writ's procedural details.
No significant divergence exists among historical sources on this term — partly because so few sources treat it at length. The consensus is that the writ existed, served a review function specific to assize proceedings, and fell into disuse as the common law's appellate architecture matured.
Jurisdictional Note
The certificate of assize is an English common law instrument with no American counterpart. It did not migrate to the colonies or the early American republic in any operative form. American researchers will encounter it only in English sources or in American treatises that survey historical English procedure for comparative purposes.