Definition
Parricidium is a term from Roman and civil law referring to the murder of a parent or close family member. In its strictest classical sense, it denoted the killing of one's father (pater), though Roman law expanded the offense considerably to encompass the murder of any near relation — including mother, grandparents, siblings, children, and other persons standing in close familial connection to the perpetrator.
The term also carried a broader application in some Roman sources: the murder of any Roman citizen of high standing, or even the killing of a patron by a client, could fall within its scope. This wider usage reflected the social and civic dimensions of Roman law, in which certain relationships carried quasi-familial obligations enforceable by the state.
---
Common Confusion
Parricidium is sometimes used interchangeably with patricide (the killing of a father specifically) or parricide (the general English derivative). These are not identical. Parricidium is the Roman legal term of art encompassing a defined and expanding category of aggravated homicide under civil law. Patricide names only one subset. Parricide in modern English criminal law (where it survives at all) refers broadly to the killing of a parent, but it lacks the formal legal architecture — including special procedural consequences — that distinguished parricidium under Roman and later civil law sources.
---
Why It Matters in Research
Researchers working in Roman law, civil law history, or comparative criminal law will encounter parricidium primarily in Digest sources, particularly Digest 48.9, which addresses the Lex Pompeia de parricidiis. That statute, attributed to the period of Sulla or Pompey, codified the offense and prescribed the punishment of the culleus — the notorious practice of sewing the condemned in a sack with animals and drowning them. Understanding that parricidium was a distinct legal category, not merely an aggravated form of homicide (homicidium), is essential to reading Roman criminal law sources accurately.
The term appears in civil law treatises received into Continental European legal systems, and researchers working in early modern French, Spanish, or Italian legal sources may find parricidium or its vernacular equivalents used in ways that carry the Roman law's expanded family-member scope, not merely the killing of a father. Do not assume the narrow English meaning of patricide applies in these contexts.
In English common law sources, parricidium has no native doctrinal home. If the term appears in an English legal text, it is almost certainly a learned borrowing from civil law or Roman law commentary, not a term with operative legal force in English courts. This distinction matters when dating and contextualizing manuscript or early printed sources.
Researchers using Black's Law Dictionary should note that the 1st edition entry for parricidium is brief but accurate, citing Digest 48.9.9 directly. The 2nd edition source material provided contains a clearly misattributed entry — the text supplied under the 2nd edition heading describes the Parliamentum Insanum of 1258, which has no connection to parricidium. This appears to be a compilation or pagination error in the source. Researchers should treat the 2nd edition entry for parricidium as unreliable based on available data and rely on the 1st edition citation and primary Roman law sources.
---
Historical Dictionary Support
Black's Law Dictionary (1st Ed.) defines parricidium as "parricide; the murder of a parent," with a direct citation to Digest 48.9.9. This is accurate as far as it goes, but the definition understates the scope of the offense as developed in Roman law. The Lex Pompeia de parricidiis extended the category well beyond parent-killing, and the Digest itself, at 48.9.1 (Marcianus), enumerates the covered relations explicitly. A researcher relying solely on Black's 1st edition definition would miss this breadth.
The 2nd edition entry, as supplied, is not a definition of parricidium and should be disregarded for this term.
Older civil law dictionaries and glossaries — such as those accompanying editions of the Corpus Juris Civilis — provide richer treatment, distinguishing parricidium from plain homicidium and explaining the procedural and punitive consequences that made the offense categorically distinct in Roman criminal law. Researchers with access to Calvinus's Lexicon Juridicum or similar early modern civil law lexica will find more complete coverage than Black's provides.
---
Jurisdictional Note
Parricidium is a Roman and civil law term with no direct equivalent in English common law. Some civil law jurisdictions, including France and Spain, retained aggravated homicide categories for familial killing in their modern codes, though under different terminology. The term itself is not operative in any current Anglo-American jurisdiction.
---