Definition
Lanis de crescentia Wal is a Latin phrase from medieval English law meaning, literally, "wools of the growth of Wales." It identified a category of wool produced in Wales that was subject to specific customs treatment—particularly in relation to the ancient writ *Lanae Traducendis Absque Custuma* (wool to be transported without customs), which permitted a merchant to pass Welsh-grown wool through an English port without paying customs a second time, on proof that customs had already been paid in Wales. The phrase functioned as a descriptive legal term of art within the wool customs system of medieval England, distinguishing Welsh-origin wool from English-grown wool for purposes of excise and port administration.
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Why It Matters in Research
This term will appear only in the narrowest stratum of medieval English administrative and commercial records—primarily writs issued out of Chancery, customs rolls, and wool staple documentation from roughly the thirteenth through fifteenth centuries. Researchers encountering this phrase in archival sources should understand that it is not a standalone legal doctrine but a descriptive qualifier embedded in the broader customs and staple framework governing the English wool trade.
The critical research trap is terminological fragmentation. The phrase does not appear consistently indexed under a single head in historical legal dictionaries. Rapalje & Lawrence and Bouvier both gesture toward the related writ (*Lanae Traducendis Absque Custuma*) without fully explaining the substantive content of the Welsh wool customs distinction that *lanis de crescentia Wal* describes. Researchers relying solely on dictionary indexes may find the writ entry but miss the underlying category of goods it addressed.
Cross-reference within the Law Mind corpus should run toward the wool staple, customs duties, and the administrative history of the English exchequer. The Welsh dimension is significant: Welsh wool was legally treated as a distinct category because Wales operated under a separate customs administration at various points in the medieval period, meaning a merchant moving wool from Welsh markets to English ports faced potential double-taxation without a writ confirming prior Welsh payment. The phrase thus encodes a practical anti-double-taxation principle within the medieval customs system.
Researchers working in English legal history before 1500 should note that Latin descriptive phrases of this type were highly specific and context-dependent; their meaning often cannot be reconstructed from the Latin alone without reference to the administrative machinery they describe.
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Historical Dictionary Support
Both Rapalje & Lawrence and Bouvier treat this subject only obliquely, through their entries on the related writ *Lanae Traducendis Absque Custuma* rather than under *lanis de crescentia Wal* directly. Both cite *Reg. Orig.* 279 (the *Registrum Omnium Brevium*, the standard medieval register of writs) as the source for the writ's form and function. Neither dictionary provides a standalone entry for the phrase as a term of art, which reflects the dictionaries' focus on writs and forms of action rather than on the descriptive Latin vocabulary embedded within them.
Rapalje & Lawrence also include a brief entry for *Lano Niger* ("a sort of base coin, formerly current in England," citing Cowell), which appears in proximity to the wool customs material. This adjacency is an artifact of alphabetical organization and carries no substantive connection to *lanis de crescentia Wal*.
No major historical legal dictionary in the standard Law Mind shelf treats the Welsh wool customs category in depth. The *Registrum Omnium Brevium* itself, and the records of the English wool staple administration, are the primary sources for understanding how this phrase operated in practice. Coke and Fitzherbert do not appear to have treated it as a term requiring extended commentary, consistent with its nature as administrative vocabulary rather than common law doctrine.
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Jurisdictional Note
This term is specific to the medieval English customs system and its application to Welsh-produced wool. It has no modern legal application and no counterpart in current English, Welsh, or other common law jurisdictions. Its relevance is entirely historical.
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