Definition
An obsolete Law French spelling of TREASON. The term appears in early English legal manuscripts and treatises, particularly in sources drawing on the Norman French legal vocabulary that dominated English law following the Conquest. It carries no independent legal meaning apart from the substantive offense of treason itself; it is a spelling variant only.
For the substance of the offense, see TREASON.
Why It Matters in Research
Researchers working in medieval and early modern English legal sources — Year Books, plea rolls, early statutes, or treatises in the Britton tradition — will encounter variant spellings of treason regularly. TRESON is one such form. Normalizing spelling was not a feature of medieval legal drafting, and the same concept may appear across a single document as treson, tresoun, traison, traisoun, or treison depending on scribe, date, and regional tradition.
The practical trap: full-text searches of digitized medieval sources using the modern spelling TREASON will miss hits recorded as TRESON or its cognates. Researchers should build variant-aware search strings when working in pre-1500 materials.
Burrill's attribution to Britton (c. 8) is useful orientation. Britton is an Anglo-Norman legal treatise of the late thirteenth century, written in Law French and presented as a royal pronouncement. It is one of the foundational texts for understanding the pre-Statute of Treasons (1351) conception of the offense. Any researcher tracing the early doctrinal history of treason back through Britton will encounter this spelling in context.
Historical Dictionary Support
Burrill's entry is minimal by design: he identifies the term as Law French, traces it to the verb treer (to draw — referencing the drawing component of the historic punishment of being drawn and hanged, or possibly the drawing of a traitor to execution), and cross-references Britton. This is appropriate for a spelling variant entry. Burrill makes no claim that TRESON carries distinct legal content from TREASON, and no other historical dictionary in the Law Mind corpus treats it as a substantive independent term. The entry's value is purely navigational — confirming that the form is attested in authoritative early sources and is not a scribal error or corruption requiring editorial emendation.