Definition
A Latin toponym appearing in historical legal and geographical records. *Langanum Promontorium* is the Latinized name for a specific promontory — a headland or projecting point of land — identified in historical sources as a geographic feature in Caernarvonshire, Wales, known in Welsh and English records as the Lleyn (or Lheyne) Promontory. The term appears in legal and quasi-legal documentary contexts as a place-name reference, not as a term of legal art carrying substantive doctrinal meaning.
The word *langanum* in this usage is a Latinization of a place name, not a Latin common noun with independent legal significance. *Promontorium* is classical Latin for a promontory or headland — a cape or point of land projecting into water.
Why It Matters in Research
Researchers encountering *Langanum Promontorium* in historical documents are most likely reading geographical indexes, boundary descriptions, charter recitals, or encyclopedic glossaries of place-names rather than substantive legal text. Burrill includes the term as part of a catalog of Latinized place-names, a category of entry common in early legal dictionaries that served as reference aids for scholars working with medieval Latin records — particularly land grants, royal charters, ecclesiastical documents, and Domesday-adjacent records where geographic identifiers appear in Latinized form.
The practical research trap here is mistaking a toponym for a term of legal doctrine. If *Langanum Promontorium* appears in a source you are transcribing or interpreting, the relevant inquiry is geographic identification, not legal definition. The Lleyn Peninsula (Caernarvonshire, North Wales) is a well-documented geographic feature and its appearance in a Latin document signals Welsh provenance or royal administrative records touching Wales.
Cross-referencing place-name glossaries — rather than substantive legal dictionaries — will be more productive once a researcher has confirmed this term is functioning as a toponym. Historical legal dictionaries of the Burrill type frequently included such entries as navigational aids for practitioners and scholars translating or working with older Latin instruments.
Historical Dictionary Support
Burrill's Law Dictionary records *Langanum Promontorium* as the Lheyne promontory in Caernarvonshire, situating it within a short catalog of Latinized place-names. The entry is brief and purely identificatory — Burrill makes no claim of doctrinal significance and offers no legal definition beyond the geographic equivalence. The surrounding entries in Burrill follow the same pattern: *Isannavantia* (Northampton), *Laudenia* or *Laudonia* (Lothian in Scotland), and similar Latin-to-vernacular place-name mappings.
This type of entry reflects a tradition in Anglo-American legal lexicography of treating Latinized geographic names as a legitimate subject of legal dictionary coverage, given that practitioners working with historical land titles, charter documents, and ecclesiastical records routinely needed to decode such names. Modern legal dictionaries have largely abandoned this category. Burrill represents one of the last major American legal dictionaries to preserve it systematically.
No other major legal dictionary in the Law Mind corpus (Black's, Bouvier's, Tomlin's, Wharton's) is known to carry a separate entry for this term.
Jurisdictional Note
The geographic referent — the Lleyn Promontory in Caernarvonshire — is located in Wales. Documents using this Latin form are most likely English royal, ecclesiastical, or common law records touching Welsh territory, particularly from the medieval and early modern periods following the incorporation of Wales into the English legal system under the Laws in Wales Acts of the sixteenth century.