Definition
De warrantia diei (Latin: "of warranty of day") was a writ in English common law that protected a party from being recorded in default when that party had been summoned to appear in court in person but was prevented from appearing because the king had called him into royal service. The writ was directed to the justices presiding over the action, commanding them not to record the party's absence as a default, with the king certifying the fact of the service obligation that caused the conflict.
The writ operated as a royal excuse: where a litigant owed a personal appearance in court on a given day, and the Crown simultaneously required that person's service — whether military, administrative, or otherwise — the writ relieved the party of the procedural consequence of non-appearance. It did not dismiss the action or grant a substantive advantage; it simply suspended the default.
Why It Matters in Research
This is an obsolete writ with no modern counterpart. Researchers are unlikely to encounter it in any live procedural context. Its relevance is confined to three settings: (1) historical research into medieval and early modern English common law procedure, particularly the system of personal appearance requirements; (2) tracing the ancestry of doctrines that excuse procedural default — concepts that survive in modified form in modern practice through provisions for continuances, stays, and excused absences in litigation; and (3) source criticism, where the writ appears as a citation anchor in treatise literature.
The primary treatise source across all dictionary entries is Fitzherbert's Natura Brevium, a foundational catalog of writs. Researchers consulting historical sources should note that Fitzherbert's work, first published in the early sixteenth century, is the authoritative original reference for this writ. The citation "Fitzh. Nat. Brev. 17, A" (Black's, Rapalje & Lawrence) and "Fitzh. N. B. 36" (Bouvier's) reflect either different editions or a transcription discrepancy in Bouvier — a characteristic inconsistency worth noting when tracing citations across the historical dictionaries in this corpus. Termes de la Ley, the other cited source, is an early English legal glossary and a common secondary anchor in writ-law entries.
Researchers should also be aware that the writ belongs to a larger family of procedural protections tied to the concept of essoins — formal excuses for non-appearance recognized by common law courts. De warrantia diei is a specialized species within that framework, distinguished by the specific character of the excuse (royal service) and the mechanism of royal certification directing the court's conduct.
Historical Dictionary Support
The four historical dictionary sources are in close agreement on both definition and scope. Black's (1st and 2nd editions) and Rapalje & Lawrence are nearly verbatim, all drawing from the same Fitzherbert citation at 17, A. Bouvier diverges slightly in phrasing — describing the king as "certifying to the fact of such service" and citing Fitzherbert at 36 — but the substantive content is identical. No source introduces any jurisdictional variation, period limitation, or doctrinal nuance beyond the core description.
What the historical dictionaries collectively omit is any connection to the broader essoin system or to the procedural consequences of default in medieval practice. They treat the writ in isolation. Researchers seeking contextual depth will need to go beyond these dictionary entries to Fitzherbert directly, or to later commentaries on common law pleading and procedure such as Blackstone's Commentaries or Glanvill, where the mechanics of personal appearance and royal excuse are more fully situated.
The Rapalje & Lawrence entry contains an apparent typographic intrusion — "office," opened, and, if of sufficient importance, returned to" — which appears to be text bleed from an adjacent entry in the source document, not part of the de warrantia diei definition. Researchers consulting that source should disregard this fragment.
Jurisdictional Note
This writ was a creature of English common law and has no recognized equivalent in American law. It did not transplant into colonial or post-independence American practice in any identifiable form. Research into analogous protective doctrines in U.S. procedure must look to statutory and rule-based mechanisms rather than writ history.