Definition
An obsolete common law writ directed to the sheriff when a prisoner could not safely be transported to court due to serious illness or physical infirmity. The writ addressed the situation created by the sheriff's return of *adeo languidus* — literally, "so ill" — meaning the prisoner's condition was too precarious to permit removal without risk of death. In such cases, the court would issue a habeas corpus in the nature of a *duces tecum licet languidus* ("bring the body, although ill"), and the guidus functioned as the procedural vehicle enabling the court to address the prisoner's status without requiring physical transfer. Where removal posed genuine mortal danger, the law declined to compel it, treating the preservation of life as a limit on the court's coercive process.
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Why It Matters in Research
This term will appear almost exclusively in pre-nineteenth century common law sources, procedural manuals, and writ registers. Researchers encountering it in historical pleadings or court records should understand it as a procedural safety valve within the habeas corpus framework — not a substantive writ altering the prisoner's legal status, but a mechanism for managing the physical impossibility of compliance with a standard return.
The term is closely intertwined with the return of *adeo languidus* (sometimes rendered *adeo languidus* or abbreviated in records as the languid return). Researchers searching for related practice will need to look under habeas corpus history, sheriff's returns, and procedural writs rather than under any substantive legal doctrine. The phrase *duces tecum licet languidus* is the fuller habeas corpus form to which guidus is connected; confusion between the writ itself and the habeas corpus issued in response is common in older commentary.
Because guidus fell into complete disuse, it has no modern procedural analog as a named writ. Contemporary law addresses the same underlying problem — prisoners too ill to appear — through judicial discretion, continuances, medical accommodations, and in extreme cases waiver of personal appearance. Researchers tracing the evolution of prisoner appearance rights or the limits of habeas corpus should treat guidus as an early terminus in that doctrinal line.
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Historical Dictionary Support
Rapalje & Lawrence, drawing on Wharton, give the clearest available account: the writ issued upon the sheriff's return of *adeo languidus*, authorized the court to proceed via habeas corpus in the *duces tecum licet languidus* form, and was already regarded as obsolete by the time of Wharton's commentary. The entry preserves the functional rule that where removal would endanger life, the law would not permit it — a principle that survived the writ itself and continued to inform judicial practice under habeas corpus doctrine generally.
The notation that "the amount is debitum in præsenti" in the Rapalje & Lawrence entry appears fragmentary or garbled — likely a copying artifact from a longer entry in Wharton's Law Lexicon — and should not be read as substantive doctrine attached to guidus specifically.
Historical dictionaries collectively offer thin coverage of this term, and none provide case authority. Its appearance in writ registers and older procedural treatises (such as Fitzherbert's *Natura Brevium* and early editions of Rolle's *Abridgement*) would be the appropriate research targets for deeper historical context, though researchers should verify any such references against original sources.
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Jurisdictional Note
Guidus is a common law writ of English origin and has no independent life in American or other common law jurisdictions as a named writ. References to it in American legal dictionaries are derivative of English sources and reflect historical rather than operative law.
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