Definition
A Latin term meaning "we will defend," used in medieval conveyancing as a formal warranty clause inserted into feoffments and deeds of gift. When a donor employed this word, it bound the donor and the donor's heirs to defend the donee's title and peaceful possession against claims of servitude, encumbrance, or adverse right — except for burdens expressly reserved in the grant itself. The clause was a species of real covenant running with the land, personal to the parties yet heritable in obligation.
Common Confusion
DEFENDEMUS should not be confused with the modern warranty of title found in present-day deeds, though it is the direct ancestor of that concept. The modern general warranty covenant is a statutory or common-law construct that has shed the Latin formula entirely; a researcher encountering defendemus in a historical document is looking at the earlier feudal mechanism, not its modern equivalent. Likewise, defendemus is distinct from the Latin warrantizabimus ("we will warrant"), which appears in similar contexts but was the more prevalent term in later medieval English practice; the two words served overlapping but not identical functions in the conveyancing vocabulary of their era.
Why It Matters in Research
Structural pattern: historical evolution — this is a term that has effectively left living legal usage and survives only in historical sources and early land records.
Researchers encounter defendemus almost exclusively in pre-modern English conveyancing instruments, Year Book references, and early American colonial land grants that followed English feudal forms. Several research traps are worth flagging:
First, the word appears in a corpus where Latin warranty language was not standardized. Scribes used defendemus, warrantizabimus, and hybrid formulas interchangeably across periods and localities, so the presence of one and not the other does not reliably signal a different legal intent. A document search keyed to one word may miss functionally identical instruments using the other.
Second, Bouvier's attribution to Cowel (John Cowell's Interpreter, 1607) places the definition squarely in the English common-law tradition. Researchers working in civil-law or Scottish jurisdictions will find the term used differently or not at all, and should not import Bouvier's gloss without checking the local tradition.
Third, the qualification — that the warranty runs against encumbrances other than those contained in the donation — is critical for interpreting historical title chains. A donee who accepted land subject to a reserved service could not later invoke defendemus to escape that burden; only unanticipated claims triggered the warranty obligation. Early American land titles derived from grants using this language may carry latent questions about what burdens were expressly reserved and what the warrantor's heirs remained obligated to defend.
Fourth, because the feudal tenure system that gave defendemus its context was abolished in England by the Tenures Abolition Act 1660 and never fully transplanted to American jurisdictions, the practical legal force of the clause in any modern proceeding is negligible. Its significance today is almost entirely interpretive and historical — useful for understanding the intent of a historical grantor or tracing title back through colonial-era records.
Historical Dictionary Support
Bouvier's is the only shelf source in the Law Mind corpus that carries a dedicated entry for this term, and it is brief. Bouvier draws on Cowell's Interpreter, which was among the earliest systematic English legal dictionaries (1607) and reflects the late Elizabethan and Jacobean understanding of feudal conveyancing vocabulary. Black's Law Dictionary later absorbed the concept within broader entries on warranty and feoffment rather than preserving the Latin term as a standalone entry — a choice that reflects how thoroughly the feudal forms were rationalized out of common-law practice by the nineteenth century.
What Bouvier does not address: the procedural mechanism by which a donee actually enforced the defendemus obligation. In medieval practice, this was accomplished through the action of warrantia cartae or, in some periods, vouching the warrantor to warranty in a real action. Neither Bouvier's entry nor Cowell's source text walks the reader through enforcement, which means researchers seeking the procedural dimension must turn to Bracton, Littleton's Tenures, or Coke on Littleton rather than any dictionary source.
Jurisdictional Note
Defendemus as an operative warranty clause belongs to the English common-law tradition of feudal tenure. American jurisdictions replaced feudal warranty mechanics with statutory deed covenants; civil-law jurisdictions (Louisiana, Quebec) handled title warranty through eviction obligations derived from Roman law rather than from this feudal formula. The term has no operative legal content in any modern jurisdiction.
Encyclopedia Cross-Reference
See WARRANTY (Real Property) for the modern covenant structure that superseded this clause. See FEOFFMENT for the conveyancing context in which defendemus originally appeared.