Definition
A formulaic phrase historically used in common law indictments for homicide and in the technical definition of murder, signifying that the alleged killing occurred within the protection of the law — that is, against a person who enjoyed the legal peace of the sovereign and of God. The phrase "in the peace of God and the said commonwealth" was a standard pleading recitation, not a theological declaration. Its operative legal function was to identify the victim as a person protected by law and to exclude from the definition of murder those killings committed against alien enemies in the actual exercise of war.
As a term of art, "peace of God" belongs to the broader medieval legal concept of the "king's peace" — the idea that the sovereign's protection extends over all persons lawfully within the realm. A killing committed against a person under that protection constituted a breach of that peace and thus an element of the crime of murder. The phrase survived in indictment forms long after its theological origins were forgotten, functioning as a legal conclusion rather than a religious invocation.
Common Language
Modern common usage (Wiktionary): "Peace of God" refers to a spiritual or theological concept — a sense of divine tranquility or, in medieval history, the Pax Dei, a church-sponsored movement limiting violence against non-combatants.
Historical common usage (Webster's 1913): Webster's 1913 does not include a discrete entry for "peace of God" as a legal term, treating it primarily in its religious and ecclesiastical sense.
The gap between common and legal meaning here is historically significant. In ordinary and religious usage, "peace of God" describes a condition of spiritual or ecclesiastical protection. In common law pleading, the phrase was entirely secularized — a formulaic assertion that the victim was a protected person under the sovereign's law. A researcher encountering the phrase in an indictment should read it as legal boilerplate, not as a religious claim.
Common Confusion
"Peace of God" in legal indictments should not be confused with the medieval ecclesiastical institution of the same name (the Pax Dei), under which the Catholic Church sought to restrict private warfare and protect non-combatants from violence. While the legal phrase likely shares historical roots with the Pax Dei tradition, by the time it appears in common law indictments it carried no ecclesiastical force. It should also be distinguished from the "king's peace" as a broader concept — the king's peace describes the sovereign's general protective authority, while "peace of God and the commonwealth" was the specific formulaic expression of that concept in homicide pleadings.
Why It Matters in Research
Researchers working with historical indictments for murder or manslaughter will encounter this phrase frequently in records from the colonial period through the nineteenth century. It is pure pleading formula — its presence signals nothing about the facts of the case and its absence or variation rarely affects the substantive analysis. Do not read theological significance into the phrase in a legal document.
The phrase's real analytical value lies in its exclusionary function: it marks the boundary between murder and lawful killing in wartime. Bouvier's citation to Wharton and to the Minnesota reporter indicates this exclusion was still being litigated in the mid-nineteenth century, particularly as courts worked through questions of military necessity and the status of enemy combatants. Researchers interested in the law of war or in the development of homicide doctrine should treat this phrase as a pointer toward that literature.
The phrase also connects to the broader evolution of indictment formalism. As criminal pleading was simplified by statute in the nineteenth and twentieth centuries, archaisms like "peace of God and the commonwealth" were progressively eliminated from required indictment language. Researchers working across a long time span should be alert to this disappearance — its absence in later records reflects procedural modernization, not a substantive change in homicide law.
The encyclopedia entry on Disorderly Conduct and Breach of Peace provides useful context for understanding how the concept of the "peace" operated across multiple criminal law doctrines.
Historical Dictionary Support
Bouvier's is the primary source here, and its treatment is characteristically terse. The entry gives the phrase, identifies its pleading context (indictments for homicide and the definition of murder), states its operative meaning (excluding wartime killings of alien enemies from the crime of murder), and cites Wharton's Criminal Law and a Minnesota case. Bouvier does not explore the phrase's medieval origins or its ecclesiastical parallel, treating it entirely as a matter of pleading practice.
What the historical dictionaries miss: no standard nineteenth-century legal dictionary provides a sustained analysis of how this phrase functioned across jurisdictions or how courts treated its omission from an indictment. The theological and historical dimensions are similarly absent. Researchers needing the deeper doctrinal history should look to Wharton's Criminal Law directly, as Bouvier himself directs.
Jurisdictional Note
The phrase appears primarily in American and English common law indictment forms. American states varied in how long they retained archaic pleading language, and some jurisdictions eliminated the formula by statute earlier than others. The Minnesota citation in Bouvier's suggests the question of its legal effect was still a live issue in American courts as late as the 1860s.
Encyclopedia Cross-Reference
Disorderly Conduct and Breach of Peace — The Law Mind Criminal Law Encyclopedia