Definition
De procedendo in assisa (Latin: "for proceeding in the assize") was a writ of English common law directing a court that had been improperly stayed or interrupted to proceed with the trial of an assize. When a superior court or other authority had wrongfully suspended the proceedings before a jury of assize, this writ commanded the lower tribunal to resume and complete the matter without further delay.
The writ functioned as a corrective instrument: it did not determine the merits of the underlying dispute but instead restored the momentum of a proceeding that had been halted without legal justification.
Why It Matters in Research
Researchers encountering this term will almost exclusively find it in sources dating from the medieval and early modern periods of English law. It belongs to a family of writs that presuppose the assize system — the ancient form of royal jury proceedings that preceded and eventually gave way to the modern common law trial. Because the assize system was largely superseded in England by the nineteenth century and never transplanted wholesale into American practice, this writ has no functional American equivalent and appears in U.S. legal literature only as a historical reference.
The key navigational point is context: if this writ appears in a document, that document is almost certainly concerned with English common law procedure before the Judicature Acts of 1873–1875, which reorganized the English court system and rendered most of the ancient writ practice obsolete. Researchers tracing the history of mandamus and procedendo as corrective writs will find de procedendo in assisa an important ancestor of both. The writ sits at the intersection of writ practice, assize jurisdiction, and the supervisory authority of superior courts — all themes with rich corpus connections.
Do not conflate this writ with the general writ of procedendo, which had broader application beyond the assize context and survived longer in recognizable form.
Historical Dictionary Support
Rapalje and Lawrence define de procedendo in assisa as a writ that lay to cause judges of assize to proceed in their office when they had been obstructed or delayed, directing them to go on with the assize notwithstanding any alleged cause for stopping. The definition is spare but accurate to the writ's function.
Historical sources treat this writ as part of the larger taxonomy of prerogative and supervisory writs — tools by which the Crown's central courts asserted control over inferior proceedings. What the historical dictionaries generally do not address is the relationship between this writ and the later development of mandamus as a generalized instrument of compulsion. Researchers should treat the writ as an early, specialized forerunner of that supervisory jurisdiction rather than as a standalone curiosity. The historical record does not offer much by way of reported cases; the writ was largely procedural infrastructure rather than a vehicle for contested legal argument.
Jurisdictional Note
This writ was exclusively a creature of English common law and has no direct counterpart in American, Scottish, or other common law jurisdictions. Researchers working in American legal history will not encounter it as operative law; its relevance is purely genealogical when tracing the ancestry of supervisory writs.