Definition
One who makes a warranty. The warrantor is the party who gives a warranty — a promise, assurance, or guarantee — to another party (the warrantee). The term appears across several legal contexts:
1. Contracts and commercial law: The party who makes an express or implied warranty in the sale of goods or services. The seller who warrants that goods conform to a particular description, quality, or fitness is the warrantor.
2. Real property (historical): In the feudal land law of England and early American practice, the warrantor was a grantor who undertook by covenant to defend the grantee's title and seisin against all adverse claims. If the warrantor failed to defend successfully, the grantee could recover equivalent land in exchange — excambium habebit ad valentiam (the warrantor shall give an exchange in proportion to its value). In this context, the warrantor's obligation ran to the grantee and, in the case of lineal warranty, could bind the warrantor's heirs.
3. Insurance (historical): The insured party making a warranty — a stipulation going to the substance of the policy — could be characterized as a warrantor with respect to the truth or fulfillment of that stipulation.
Common Confusion
Warrantor and warranter are occasionally treated as interchangeable spelling variants; warrantor is the standard legal form. More substantively, warrantor should not be confused with guarantor, though both roles involve a promise of assurance to another party. A guarantor's obligation is typically secondary — triggered by the default or failure of a principal obligor — while a warrantor's obligation arises directly from the breach of the warranty itself, without the need to establish a third party's default first.
Why It Matters in Research
The term warrantor is stable in its core meaning — one who makes a warranty — but the legal weight attached to that role varies dramatically depending on context and era. Researchers must be alert to two common traps.
First, the real property sense of warrantor is largely obsolete in modern American practice. In historical sources predating the 19th-century consolidation of real property law, warrantor carries specific procedural significance: the warrantor could be vouched into court to defend title, and failure to defend triggered a right to substituted lands. Reading historical deeds, conveyances, or pleadings without understanding this mechanism can cause serious misreading of the parties' obligations and remedies.
Second, the insurance sense of warrantor — the insured who makes a warranty — runs counter to how most researchers instinctively read the term. Modern usage tends to locate the warrantor on the side of the party giving assurances (seller, manufacturer); in insurance law, the warrantor was the insured making representations that formed conditions of the policy. This inversion matters when reading older insurance cases or policy language.
In the corpus, warrantor appears most frequently in three clusters: (1) historical property law materials discussing warranty of title and vouching to warranty; (2) commercial law and UCC-adjacent materials discussing seller obligations; and (3) consumer protection and product liability materials where the term has a more modern, regulatory flavor. Do not assume that usage in one cluster carries over to another.
The maxim quoted uniformly across historical dictionaries — Warrantor potest excipere quod querens non tenet terram de qua petit warrantiam, et quod donum fuit insufficiens (Hob. 21) — is a practical defense rule: the warrantor may challenge whether the claimant actually holds the land at issue and whether the original conveyance was legally sufficient. Researchers encountering warranty litigation in early common law or colonial records should be familiar with this defense.
Historical Dictionary Support
The historical sources are in close agreement on the core definition. Black's (both editions), Rapalje & Lawrence, and Bouvier all define warrantor as "one who makes a warranty," each citing Sheppard's Touchstone (181) as authority. The alignment across sources reflects that this is a term of settled technical meaning with little doctrinal dispute.
All sources reproduce the same Latin maxim from Hobart 21, indicating that this defense rule was considered a central piece of practical knowledge associated with the term. Rapalje & Lawrence adds a notable dimension absent from the others: the warrantor in the feudal property context could include "the heir of one's husband," flagging the hereditary dimension of lineal warranty obligations — heirs of a warrantor could be bound to make good on a warranty given by their ancestor. This detail is historically significant and easily missed when relying solely on Black's.
Bouvier pivots quickly from the property-law warrantor to a substantial treatment of warranty in the insurance context, which provides useful connective tissue but stops short of explicitly labeling the insured a warrantor. Researchers should note that the historical sources do not address the modern commercial or consumer-protection sense of warrantor at all — that usage developed substantially through 20th-century uniform laws and statutory regimes.