Definition
A historical writ of English common law practice, now obsolete. The phrase translates literally as "bring with you, although sick." The writ operated as a variant of the habeas corpus, directed specifically to circumstances in which a sheriff had returned that he could not produce a prisoner before the court because the prisoner was so gravely ill — adeo languidus, meaning "so sick" — that transportation posed a risk of death. When such a return was made, the court would issue a writ in the nature of a duces tecum licet languidus, commanding the prisoner's production while acknowledging and formally accommodating the medical impediment. It belongs to the broader family of writs that enforced bodily presentation before a tribunal, adapted here for the exceptional case of the incapacitated prisoner.
Common Confusion
Researchers encountering this term should not conflate it with the standard duces tecum, which is a modern subpoena commanding the production of documents or physical evidence — a wholly different procedural instrument with no connection to prisoner transport or habeas practice. The shared Latin root (duces tecum, "bring with you") creates a superficial resemblance, but the duces tecum licet languidus addressed a body; the modern duces tecum addresses things. Similarly, the writ is distinct from the standard habeas corpus ad subjiciendum, though it functioned in its nature. The licet languidus component — the operative qualifying clause — is what differentiates this writ from all others in the habeas corpus family and is the essential term of art.
Why It Matters in Research
This term will appear almost exclusively in historical English legal sources and in treatises and dictionaries cataloguing obsolete writs. It is not a term of live law in any common law jurisdiction. Researchers are most likely to encounter it in one of three contexts: (1) historical surveys of habeas corpus practice and the procedural evolution of prisoner-production writs; (2) early English court records or sheriff's returns where the adeo languidus formula appears; and (3) legal dictionaries and glossaries of the early modern period that aimed comprehensive coverage of the writ system.
The critical navigational point is the relationship between the sheriff's return and the writ's issuance. The procedural trigger — the sheriff's declaration that production would endanger life — is itself a distinct legal event. Corpus researchers tracing the development of habeas corpus practice should note that this writ represents an early attempt to balance the court's absolute right to the prisoner's body against the practical reality of illness and mortality risk in transit. That tension is historically significant: it shows the writ system developing equitable modifications to accommodate human physical limitation without abandoning the underlying command of production.
Because the writ is obsolete, researchers should not expect to find it in post-eighteenth century practice materials. Its appearance in Black's 2nd edition reflects that dictionary's strong orientation toward historical completeness rather than current practice utility.
Historical Dictionary Support
Black's Law Dictionary (2nd Ed.) provides the sole entry among the source dictionaries, and its account is brief but structurally complete: it identifies the writ as ancient and obsolete, supplies the translation, explains the procedural context (the sheriff's return of adeo languidus), and notes that the court's response was to grant a habeas corpus in the nature of the duces tecum licet languidus. Black's cites Cowell and Blount — John Cowell's Interpreter (1607) and Thomas Blount's Nomo-Lexikon (1670), two of the principal early modern English legal glossaries — as authorities, which signals the term's deep historical roots and confirms it was already receding from active practice by the time those glossaries were compiled.
What historical dictionaries collectively miss is any sustained account of how frequently the writ was actually invoked, what threshold of illness satisfied the adeo languidus return, or how courts verified the claimed medical incapacity. The doctrinal skeleton is preserved; the procedural flesh is not. Researchers seeking those details would need to turn to records of the English common law courts directly.
Jurisdictional Note
This writ was a product of English common law practice and did not establish a parallel presence in American colonial or post-independence courts as a distinct writ. American habeas corpus practice developed its own procedural accommodations for incapacitated prisoners through statute and court rule rather than through the duces tecum licet languidus form.