Definition
In legal usage, MONA is a Latin or archaic geographical designation referring to one or both of two islands in the British Isles: the Isle of Anglesey (located off the northwest coast of Wales) and the Isle of Man (located in the Irish Sea between Great Britain and Ireland). The term appears in older legal texts, charters, ecclesiastical records, and historical documents where the Latin name was used in place of the vernacular English or Welsh designations. Some sources apply MONA specifically to Anglesey; others use it more loosely to encompass the Isle of Man as well. Wharton's entry, as cited by Rapalje and Lawrence, acknowledges this ambiguity directly.
Common Language
Modern common usage (Wiktionary): A female given name of Irish or Arabic origin; also a geographic name for a small island in the Puerto Rico archipelago and a city in Utah.
Historical common usage (Webster's 1913): A species of West American monkey (Cercopithecus mona) with a dark olive body and white haunch markings.
Neither the common personal name nor the zoological usage has any connection to the legal term. When MONA appears in a legal or historical document, the geographical meaning should be assumed first and the specific island identified from context.
Common Confusion
The principal source of confusion is that MONA could refer to either Anglesey or the Isle of Man depending on the author and period. These are distinct jurisdictions with different legal histories: Anglesey is part of Wales and subject to English and Welsh law; the Isle of Man is a Crown dependency with its own legislature (the Tynwald) and legal system, and is not part of the United Kingdom proper. A researcher who encounters MONA in a medieval charter, ecclesiastical document, or legal proceeding must determine from context which island is intended before drawing any legal conclusions about jurisdiction, tenure, or rights.
Why It Matters in Research
MONA is a narrow term with limited but specific research utility. Its relevance is concentrated in historical and archival legal materials — particularly medieval charters, ecclesiastical records, land grants, and royal writs touching on the British Isles.
The ambiguity flagged by Wharton is practically significant. Documents referencing MONA in connection with Welsh affairs, the diocese of Bangor, or land tenure in northwest Wales almost certainly mean Anglesey. Documents touching on the Irish Sea, Norse or Manx history, or the lordship and later kingship of Man are more likely to intend the Isle of Man. The two islands share the Latin name because both were known as MONA in classical and medieval sources, but their legal and jurisdictional histories diverged sharply.
Researchers using Law Mind's corpus of historical legal dictionaries should note that MONA appears as a brief cross-reference rather than a developed entry. The Rapalje and Lawrence entry routes directly through Wharton, indicating this was not a term requiring independent doctrinal elaboration — it is a geographical identifier, not a term of art. Its appearance in a primary source signals a need for geographical and jurisdictional disambiguation, not doctrinal analysis.
Historical Dictionary Support
Rapalje and Lawrence provide a single-sentence entry derived from Wharton, which itself offers minimal elaboration. The phrase "perhaps for both" is editorially candid: even experienced lexicographers working in the late nineteenth century acknowledged that the term's referent was not fixed across sources. No major American legal dictionary of the period treats MONA as a term requiring extended definition, which is consistent with its function as a Latin place-name rather than a legal concept. The historical dictionaries do not disagree with each other on substance; they simply reflect the classical ambiguity without resolving it.
Jurisdictional Note
The distinction between Anglesey and the Isle of Man is jurisdictionally material. Anglesey falls within the jurisdiction of England and Wales; the Isle of Man is a self-governing Crown dependency whose laws, courts, and tenure rules operate independently of Westminster legislation unless extended by Order in Council.