Definition
A Latinized place-name used in medieval legal documents to denote the River Taff in Glamorganshire, Wales. The term appears in Latin legal instruments — charters, grants, boundary descriptions, and ecclesiastical records — where the river served as a geographic marker or boundary reference. Like many Latinized toponyns in medieval legal usage, Taffus is not a legal concept but a geographic identifier rendered in the Latin form required by formal legal drafting of the period.
Why It Matters in Research
Researchers working with medieval Welsh land records, monastic charters, or Crown grants touching Glamorganshire may encounter Taffus where a modern document would simply read "the River Taff" or "Taff." The significance is purely navigational: failure to recognize the Latinized form can cause a researcher to misread or mislocate a boundary description, misidentify the subject lands, or fail to connect a document to its geographic context.
The term belongs to a class of Latinized Welsh and English toponyms that populate medieval legal instruments. These forms were standardized within individual scriptoria or chancery traditions and do not always follow a predictable pattern of Latinization. Burrill records Taffus alongside Totonensium (Totness, Devonshire) in the same entry, suggesting he was cataloguing these forms as a reference aid for exactly this kind of identification problem — a reminder that historical law dictionaries sometimes functioned as geographical and philological reference tools, not only as legal concept dictionaries.
When reading boundary clauses in medieval grants or inquisitions post mortem involving South Wales, a working list of Latinized place-names is as important as knowledge of the substantive law. Taffus is one entry on that list.
Historical Dictionary Support
Burrill's Law Dictionary is the sole historical dictionary source to record Taffus. His treatment is minimal — little more than a gloss identifying the term as the River Taff in Glamorganshire — but this is appropriate to the nature of the entry. There is no legal doctrine attached to the word; it is definitional in the narrowest sense. Burrill's inclusion of such geographic identifiers reflects the practical orientation of nineteenth-century legal dictionaries, which served practitioners and researchers who needed to decode Latin instruments without access to specialist paleographic or historical-geographic references. No significant divergence or evolution in the term's meaning is possible, as it is a proper name rather than a legal concept.