Definition
A Latin legal term meaning "a leper" — a person diagnosed with leprosy (Hansen's disease). In medieval and early modern English law, the term carried direct legal significance, as certain writs and disabilities attached to a person upon identification as a leper. The condition was not merely a medical classification but a recognized legal status that could affect a person's capacity to participate in civil and community life.
Associated writ — Leproso amovendo: A writ of removal directed at a leper who intruded into the company of neighbors in a parish — whether at church, public gatherings, or other communal spaces — to their annoyance or disturbance. The writ authorized the removal of the afflicted person from those settings. The form is recorded in the Registrum Omnium Brevium (Reg. Orig. 237).
Common Language
Modern common usage (Wiktionary): A person affected by leprosy; one suffering from Hansen's disease. Used today primarily in medical, historical, or figurative contexts.
Historical common usage (Webster's 1913): "Leprous" — infected with leprosy; of the nature of leprosy. "Leper" — one affected with leprosy.
The common and legal meanings share the same descriptive core, but the legal term carried consequences the ordinary word does not. In law, leprosus was a status classification that triggered specific legal mechanisms — most notably the writ of leproso amovendo — rather than a simple description of medical condition.
Recognized Forms
/SUBTYPES
Leproso amovendo: The primary writ associated with the term. A prerogative or common law writ directed at the removal of a leper from public or communal spaces upon complaint by neighbors or parishioners. It operated as a form of compelled exclusion and reflects the broader medieval legal treatment of leprosy as a condition justifying civic disability.
Why It Matters in Research
This term belongs to a category of obsolete legal statuses — conditions of the person that altered legal capacity or triggered specific remedies — that have no surviving modern counterparts. Researchers encounter leprosus almost exclusively in medieval English legal sources, Year Books, early writ registers, and treatises on the forms of action.
Several research traps apply. First, leproso amovendo is listed among the ancient and largely theoretical writs; whether it was regularly used in practice, or existed primarily as a registered form, is a question historical sources leave open. Second, the writ must be distinguished from quarantine or public health powers that developed later under statute; leproso amovendo was a private or communal remedy, not a crown health measure. Third, researchers consulting the Registrum Omnium Brevium for the writ form should be aware that the Reg. Orig. contains forms that were available in principle but may not reflect common judicial practice.
The broader legal context is the medieval doctrine of civil disability attached to status — a cluster that also includes outlawry, attainder, villeinage, and excommunication. Leprosus as a legal category sits within that framework and is best understood alongside those related status disabilities rather than in isolation.
For corpus researchers, the term appears rarely outside dictionaries and writ registers. Its value is primarily taxonomic: understanding how medieval English law translated a physical condition into a legal status with procedural consequences.
Historical Dictionary Support
Black's Law Dictionary (2nd Ed.) provides the only dictionary source available for this entry, and its treatment is characteristically compressed. Black's identifies the writ, names it, summarizes its operative scope (intrusion into parish company), and cites Reg. Orig. 237. This is adequate for identification but offers no discussion of whether the writ was distinct from ecclesiastical remedies addressing the same problem, nor does it address the question of how leprosus status was formally established — whether by medical finding, community declaration, or judicial determination.
Historical dictionaries generally do not address the evidentiary or procedural mechanism for designating someone leprosus for legal purposes. That gap is significant: if the legal disabilities of the status depended on some form of official finding, the process by which that finding was made is largely unaddressed in standard reference sources and requires recourse to primary legal records or specialized historical scholarship on medieval medicine and law.
Jurisdictional Note
The term and its associated writ are specific to English common law and its medieval writ system. No American or modern common law jurisdiction retains the concept. Researchers working in civil law or non-English traditions will find no direct analog under this name.