Definition
In Roman and civil law, exhazredatio is the formal act by which a testator expressly excludes an indefeasible heir — a forced heir entitled by law to a portion of the estate — from the entire inheritance. This exclusion had to appear in the will itself as an express declaration; silence or omission was insufficient. The term is closely associated with its product: the condition of being exhares, meaning disinherited. Exhazredatio is the act; exheredatio (a variant spelling) and disherison are its equivalents in parallel traditions.
Common Confusion
EXHAZREDATIO vs. PRETERITION: These are related but distinct concepts. Preterition is the omission of a forced heir from the will — passing over in silence. Exhazredatio is the opposite move: an explicit, formal declaration of exclusion. Roman law treated these differently. Preterition of a son, for example, could void the entire will; exhazredatio, when properly executed, achieved the disinheritance without that nullifying consequence. Researchers encountering the term in civil law sources should not conflate it with the mere failure to mention an heir.
Why It Matters in Research
This is a term of Roman civil law that surfaces almost exclusively in historical legal sources and comparative law scholarship. Researchers will encounter it in materials treating Roman testamentary law, the Louisiana civil tradition, and Scottish or South African legal history — jurisdictions where the civil law legacy of forced heirship remained operative long after common law jurisdictions abandoned the concept entirely.
The spelling exhazredatio is a variant found in older English-language treatments of Roman law. The more common Latin form in original sources is exheredatio. When searching historical databases or manuscript indexes, researchers should run both forms, as well as the anglicized disherison and disinheritance, to capture the full range of relevant materials.
The concept of forced heirship — the background against which exhazredatio operates — has a complicated modern history. Louisiana progressively restricted forced heirship through constitutional and statutory amendments in the late twentieth century, making certain historical Louisiana materials anachronistic if read without attention to the relevant time period. In jurisdictions that follow pure common law, forced heirship does not exist and exhazredatio has no operational analog; a testator may freely disinherit any heir without formal declaration.
Researchers tracing the term through secondary sources should note that many Anglo-American legal encyclopedias treat disinheritance without reference to exhazredatio at all, reflecting the common law's indifference to the formal Roman distinction between exclusion and omission.
Historical Dictionary Support
Black's Law Dictionary (2nd ed.) provides the primary English-language legal dictionary treatment. The entry is concise: exhazredatio is defined as the formal method of excluding a forced heir from the entire inheritance by the testator's express declaration in the will, with the authority attributed to Mackeldey's Roman Law. The citation to Mackeldey (Ferdinand Mackeldey, Handbook of the Roman Law) anchors the definition firmly in the civilian doctrinal tradition rather than in English case law.
Black's entry conveys the essential formal requirement — express declaration — without elaborating on the procedural context. Historical Roman law sources make clear that the rules governing exhazredatio were technically demanding: descendants in the first degree required nomination by name; more remote descendants could in some cases be disinherited collectively. These distinctions do not appear in Black's entry, which treats the term at a level appropriate for an Anglo-American legal dictionary with only incidental coverage of civil law concepts.
No other shelf sources in the Law Mind corpus provide independent entries for this term. The absence of coverage in later editions of Black's or in competing dictionaries of the period reflects both the term's specialized scope and the declining relevance of formal Roman testamentary categories to common law practice.
Jurisdictional Note
Exhazredatio as a operative legal concept is relevant primarily in civil law jurisdictions that recognized forced heirship: Louisiana (with significant modern restrictions), Scotland, and comparative law contexts. Common law jurisdictions do not require formal disinheritance declarations; a testator's silence as to an heir is generally sufficient to exclude them.