Definition
In old European law, a deadly feud was a formal profession of irreconcilable enmity declared by the kinsmen of a slain person against the killer or the killer's family, persisting until satisfaction was obtained — even if that satisfaction required the enemy's death. The concept operated as a recognized legal or quasi-legal state of ongoing hostility, not merely a private quarrel. It was understood as a mode of private enforcement when no public remedy or pecuniary compensation had been accepted or offered for a killing.
The Latin equivalents — faida mortalis or faida mortifera — signal the connection to the broader Germanic and Saxon institution of the feud (faida), of which the deadly feud was the most extreme and lethal form.
Common Language
Modern common usage (Wiktionary): A feud is a prolonged and bitter quarrel or dispute, especially between families or factions, often passed down across generations.
Historical common usage (Webster's 1913): A feud is a combination of kindred to avenge injuries or quarrels; especially, a blood feud carried on by one family against another in return for injuries.
The gap between common and legal meaning here is one of legal status rather than substance. In ordinary usage, a feud is a social or interpersonal conflict. In the old legal sense, a deadly feud was a recognized institution — a declared state of hostility that carried specific legal implications, including a conditional license to pursue vengeance that would not otherwise be permitted. The legal concept is thus not simply a description of animosity but a formal posture with procedural and customary dimensions under Saxon and early English law.
Common Confusion
Deadly feud is sometimes loosely conflated with blood feud, wergild disputes, or the broader concept of faida. These are related but distinct. Blood feud (faida) was the general institution; deadly feud was its terminal form, invoked specifically when pecuniary satisfaction — wergild — had not been offered or accepted. Wergild was the payment mechanism designed precisely to prevent the deadly feud from arising. Researchers should not treat these terms as synonyms when working with early medieval or Saxon legal sources.
Why It Matters in Research
This term is essentially obsolete as living law but appears regularly in historical legal sources covering Saxon, Germanic, and early Norman legal institutions. Researchers working in the Law Mind corpus on topics such as the development of criminal law, the history of homicide, the origins of outlawry, or the transition from private vengeance to public prosecution will encounter this term in explanatory passages rather than operative legal rules.
Several traps await the inattentive researcher:
First, sources vary in how they frame the legal status of the deadly feud. Some treat it as a recognized right; others treat it as a tolerated custom; still others present it as a problem that early law sought to suppress through wergild and later through royal jurisdiction over homicide. The framing matters for understanding the argument the source is making.
Second, Burrill's reference to Stat. 43 Eliz. signals that the term was still in technical use as late as the Elizabethan period in the context of border law — specifically the predatory raids and reprisals on the northern borders between England and Scotland. This gives the term a longer legal life than Black's entries suggest, and researchers focused on border administration or Marches law should note the extension.
Third, the Latin forms (faida mortalis, faida mortifera) appear in continental and ecclesiastical sources as well as English ones. A researcher tracking the term across jurisdictions needs to follow the Latin, not just the English phrasing.
Historical Dictionary Support
Black's Law Dictionary (both editions) offers a minimal, near-identical definition: a profession of irreconcilable hatred until a person is revenged even by the death of his enemy. This is accurate but stripped of context.
Burrill's Law Dictionary is substantially more useful. It supplies the Latin equivalents, grounds the institution in Saxon law, explains the conditional trigger (no pecuniary satisfaction having been made), cites Spelman's Glossarium for further authority, and — critically — extends the term's reach to the predatory border warfare addressed by Elizabethan statute. Spelman's Glossarium Archaiologicum, Burrill's cited authority, is the foundational reference for the Latin faida and its derivatives in English legal history.
None of the historical dictionaries address the comparative dimension — the near-identical institutions in Frankish law (faida under Salic and Ripuarian customs) or Scandinavian law — which may matter for researchers working across legal traditions.
Jurisdictional Note
The deadly feud as a formal legal concept belongs to Saxon and early medieval English law and has no operative existence in modern common law jurisdictions. Its closest functional descendants — the law of homicide, outlawry, and the crown's assertion of jurisdiction over serious violent crimes — developed precisely by displacing private feud as a remedy. Researchers working in Scottish legal history should note that border feud law had a distinct statutory and customary development under Scots law that differs from English treatment.