Definition
Diversitas is a Latin term from old English law meaning diversity, difference, or unlikeness. It appears primarily in the context of documentary authentication and the detection of forgery, where it denotes observable discrepancies in a written instrument — such as variations in handwriting, ink, or pen — that raise doubt about the document's genuineness or integrity.
The term is closely associated with the treatise tradition of medieval English law, particularly Bracton's De Legibus et Consuetudinibus Angliae, which catalogued physical signs of documentary irregularity that a court or examiner might consult when evaluating whether a charter, deed, or other instrument had been altered, interpolated, or fabricated.
Common Confusion
Diversitas should not be confused with the modern procedural concept of diversity jurisdiction (derived from a related Latin root but operating in an entirely different legal context). The two terms share etymological ancestry but are functionally unrelated. A researcher encountering diversitas in a medieval or early modern legal source is reading about document examination, not subject-matter jurisdiction.
Why It Matters in Research
Researchers working in medieval English legal sources, particularly manuscript records, plea rolls, or treatise literature through the thirteenth and fourteenth centuries, will encounter diversitas in the specific technical sense of documentary discrepancy. It is a term of art within the early law of evidence and proof, not a general philosophical or procedural concept.
Several navigational points deserve attention:
First, the term is almost exclusively Bractonean in its formal legal usage. Glanvill does not use it in the same technical sense, and post-medieval practitioners largely abandoned the terminology as common law evidentiary doctrine evolved. Encountering diversitas in a source later than the fifteenth century likely signals either a learned antiquarian citation or a direct quotation from Bracton rather than living doctrine.
Second, the specific subcategories — diversitas calami (difference of pen), diversitas scribendi (difference of writing or script), diversa manus (different hand), and diversitas incausti (difference of ink) — functioned as a checklist of observable forgery indicators. Understanding these subcategories is essential to interpreting Bracton's discussion of charter proof and the role of the document itself as evidence. These are not merely stylistic observations; in the Bractonian framework, their presence could defeat reliance on an instrument in pleading.
Third, researchers consulting Burrill's Law Dictionary will find the entry truncated — the source material cuts off mid-phrase at diversitas calami, vel atrame[nti], suggesting the original entry extended further. Any research relying solely on Burrill's version of this definition should be cross-checked against the Bracton text directly (folio 398b and surrounding passages) for the complete catalogue of diversitas types.
Fourth, this term connects Law Mind's historical document corpus to the broader history of forensic document examination. The Bractonian framework for detecting alterations in instruments is an ancestor of what later became the law of ancient documents and, eventually, modern forensic evidence doctrine. Researchers tracing that lineage will find diversitas a useful starting point.
Historical Dictionary Support
Burrill's Law Dictionary is the primary shelf source treating diversitas, and it does so in a narrow but precise way — locating the term squarely within Bracton and providing the Latin-French parallel form diversite. Burrill accurately conveys that the term's legal significance is observational and evidentiary: it names the class of physical discrepancies in a document that signal potential inauthenticity.
What Burrill's entry does not address is the procedural consequence of a finding of diversitas. Bracton's treatment implies that a document exhibiting such differences could be challenged or lose its probative weight, but the entry in Burrill stops short of explaining how this interacted with the forms of pleading or with trial by witnesses versus trial by the document itself. Researchers should not treat Burrill's entry as a complete account of Bractonian document law — it is an accurate fragment, not a full analysis.
No other standard historical legal dictionaries in the Law Mind corpus (Jacob's, Tomlin's, Bouvier's, Black's early editions) provide substantive entries for diversitas, likely because the term passed out of active English legal usage well before those dictionaries were compiled. Its survival in Burrill reflects that dictionary's broader coverage of Roman and medieval Latin legal vocabulary.
Jurisdictional Note
Diversitas is a term of specifically English medieval legal tradition, rooted in the common law treatise literature. It has no recognized parallel usage in Scottish, Irish, or American legal sources in the same technical sense. Civil law systems developed analogous but terminologically distinct frameworks for document authenticity.