Definition
De cujus (Latin: "from whom") is a shorthand phrase used in property and succession law to identify the person from whose estate a right, title, or inheritance derives. In probate and estate contexts, the de cujus is the decedent — the person who has died and whose property is being distributed. In a broader property sense, the phrase identifies the person through whom a claimant traces a right or interest, whether by inheritance, deed, or legal succession.
The term functions as a convenient label in legal writing and pleading to avoid repeatedly naming the deceased or source-person. Where a dispute turns on rights descending from a particular individual, that individual is the de cujus of the transaction or proceeding.
Common Confusion
De cujus is sometimes loosely treated as a synonym for "decedent," "testator," or "intestate." While all four terms may describe the same person in a given case, they are not interchangeable. Decedent is the general term for any person who has died. Testator specifies a person who died leaving a valid will. Intestate describes a person who died without one. De cujus, by contrast, is relational — it identifies the person from whom something flows. The emphasis is on the derivation of a right or claim, not simply on the fact of death. A de cujus in a property dispute need not always be a decedent in the strict sense; historically the term could refer to any person whose legal position is the source of a successor's claim.
Why It Matters in Research
Researchers working in succession law, civil law jurisdictions, and older equity materials will encounter de cujus with some frequency. A few navigational points:
Civil law lineage. The term is far more common in civil law systems (France, Louisiana, Quebec, and their historical materials) than in common law jurisdictions. In Louisiana sources in particular — illustrated by the Black's citation to Brent v. New Orleans — de cujus appears as standard vocabulary in succession and property disputes. Researchers working with Louisiana materials from the 19th and early 20th centuries should expect the term and understand it as equivalent to the decedent or source-grantor in context.
Sparse coverage in common law dictionaries. Most English common law dictionaries give de cujus little or no treatment. Its appearance in Black's 2nd Edition is brief, and later editions of Black's fold the concept into broader succession vocabulary. Researchers relying only on common law sources may encounter the term in translated civil law materials, international private law texts, or comparative law scholarship without adequate definitional support.
International and comparative law. In international succession disputes and private international law materials, de cujus appears as a term of art identifying whose estate — and whose national law — governs. EU Succession Regulation No. 650/2012, for example, uses de cujus as the standard reference throughout. Researchers working in conflict-of-laws or cross-border estate planning will find this usage important.
Corpus connections. The term connects the property, probate, and conflict-of-laws portions of the Law Mind corpus. When tracing chain of title or succession rights through historical documents, identifying the de cujus is often the first analytical step.
Historical Dictionary Support
Black's Law Dictionary (2nd Ed.) defines de cujus simply as "From whom. A term used to designate the person by, through, from, or under whom another claims." The entry is minimal but accurate. It cites Brent v. New Orleans, a Louisiana case, which signals the civil law context of the term's primary usage in American jurisprudence.
What the historical dictionaries miss is the term's fuller role in civil law succession doctrine, where de cujus is not merely a convenient label but a term of technical precision identifying the legal anchor of an entire succession proceeding. The brevity of coverage in Black's reflects common law indifference to the term rather than any limitation in its meaning.
Jurisdictional Note
De cujus is standard legal vocabulary in Louisiana and in jurisdictions with civil law heritage. In common law states it is rarely used in domestic practice and appears mainly in academic writing, comparative law analysis, and international succession matters. Researchers should adjust their source expectations accordingly.