Definition
A preliminary or preparatory oath required of both parties before trial or purgation in Saxon law. The antejuramentum bound the accuser to a sworn commitment to prosecute the alleged criminal and required the accused to swear, on the very day of ordeal, that he was innocent of the charged offense. The oath preceded and conditioned the proceeding itself — neither party could advance to trial or undergo purgation without first having taken it.
The term is also rendered as praejuramentum (or prejuramentum) and juramentum calumniae, the latter connecting it to the broader medieval concept of an oath against calumny or false accusation.
Common Confusion
ANTEJURAMENTUM, PRAEJURAMENTUM, and JURAMENTUM CALUMNIAE are treated as synonyms across historical dictionary sources, but the terms carry slightly different emphases. Antejuramentum emphasizes timing — an oath taken before (ante) proceedings. Praejuramentum carries the same meaning. Juramentum calumniae, however, has a broader application in canon and civil law as an oath against bringing a vexatious or malicious action — a concept that survived into ecclesiastical procedure long after Saxon ordeal practice disappeared. Researchers should not assume that a source referencing juramentum calumniae is necessarily describing the Saxon preparatory oath; it may be addressing the anti-calumny oath in a wholly different procedural context.
Why It Matters in Research
This term appears almost exclusively in sources treating Saxon and early English legal procedure and is essentially absent from modern legal usage. Researchers will encounter it in historical legal dictionaries, treatises on Anglo-Saxon law, and scholarship on trial by ordeal — not in case law or contemporary statutes.
The key research trap is treating the antejuramentum as equivalent to a modern oath of prosecution or a plea of not guilty. It is neither. It functioned within a system of proof — ordeal by fire, water, or combat — that has no direct modern counterpart. Understanding it requires situating it within the ordeal framework: the oath was both a ritual and a procedural prerequisite, and its breach carried spiritual as well as legal consequences in the Saxon conception.
Researchers working in the Law Mind corpus should note that when historical dictionaries cross-reference juramentum calumniae, they are pointing to a term with a longer life and wider application in civil and canon law. Following that cross-reference without recognizing the divergence between the Saxon preparatory oath and the anti-calumny oath in later ecclesiastical procedure will produce confusion. Treat the synonyms as contextually dependent.
The term also connects to the broader history of compurgation and oath-helping. The antejuramentum is the accuser's and accused's individual oath; compurgation (wager of law) involves oath-helpers swearing to the accused's credibility. These are distinct mechanisms that operated at different stages and should not be conflated when reading historical sources that discuss Saxon proof procedures.
Historical Dictionary Support
Black's (1st ed.), Black's (2nd ed.), and Burrill's Law Dictionary are in full agreement on the definition — all three describe the antejuramentum as a preparatory oath required of both accuser and accused before trial or purgation in Saxon law. The agreement is unsurprising, as these entries draw from the same base of historical scholarship on Anglo-Saxon legal procedure.
None of the three sources expands meaningfully on the consequences of refusing or failing the antejuramentum, the precise ritual form it took, or how it interacted with different types of ordeal. For that level of detail, researchers must move beyond legal dictionaries to primary scholarship on Saxon law. Burrill's entry is the most careful in its cross-referencing, explicitly directing the reader to juramentum calumniae as a separate entry worth consulting.
The historical dictionaries present this as a finished, historical category — there is no suggestion of any surviving procedural descendant or modern analog, and that characterization is accurate.
Jurisdictional Note
Antejuramentum belongs exclusively to the legal history of Saxon England. It has no application in modern common law jurisdictions and does not appear in civilian or canon law systems under this name, though juramentum calumniae does have a parallel life in those traditions.