Definition
In Roman law and civil law-influenced legal systems, *patruus magnus* is a Latin kinship term designating a granduncle — specifically, a grandfather's brother. The term appears in legal contexts primarily in the classification of degrees of relationship for purposes of inheritance, intestate succession, and the determination of cognatic or agnatic kinship.
Recognized Forms
/SUBTYPES
Roman law developed a precise series of terms within this family of designation:
- PATRUUS MAGNUS: A grandfather's brother; granduncle.
- PATRUUS MAJOR: A great-grandfather's brother; great-granduncle. This form appears in Rapalje & Lawrence as a distinct, formally recognized extension of the same classificatory principle.
The progression reflects the Roman juristic habit of extending relational vocabulary systematically across ascending generations, each step adding a degree of remoteness.
Why It Matters in Research
This term is pure Roman law taxonomy and will appear almost exclusively in civil law materials, treatises on the law of descent, and historical common law sources that borrowed civilian vocabulary to describe remote degrees of kinship. Researchers encountering *patruus magnus* in an American or English legal text should treat it as a signal that the document is either drawing directly on Roman or civil law sources or is engaging in the classification of collateral relatives for succession purposes.
The principal research trap is confusion arising from manuscript abbreviation and typographical corruption. Rapalje & Lawrence's entry for *patruus magnus* contains an evident printing error, with extraneous text about auction statutes and mortgages intruding mid-entry — almost certainly the result of a typesetting collision between adjacent entries. Researchers relying on that source should verify the entry against Burrill or Black's to confirm they are reading the kinship definition and not a corrupted passage.
The term becomes practically relevant in historical succession disputes involving remote collateral heirs. When an intestate decedent left no closer relations, courts and counsel working in civil law jurisdictions — or common law courts applying civil-law-derived rules of descent — would need to identify and rank claimants at this degree of kinship. The Latin terminology was the standard vocabulary for doing so, and pleadings, wills, and judicial opinions through the nineteenth century routinely used these terms without translation.
Researchers tracing American intestate succession law should be aware that by the time most state succession statutes were codified, courts had largely abandoned the Latin designators in favor of plain-English descriptions (e.g., "granduncle") or degree-counting systems. The Latin terms survive mainly in the older treatise literature and in judicial opinions citing civilian or canonical authorities on consanguinity.
Historical Dictionary Support
The three source dictionaries converge on the core definition without meaningful disagreement: a grandfather's brother. Burrill provides the most scholarly treatment, grounding the term in Roman law and citing the Digest (Dig. 38.10.1.6 and Dig. 38.10.10.15), which address the rules of succession among cognates. These Digest passages concern the praetorian rules on bonorum possessio — the granting of possession of an estate to cognate relatives — and represent the authoritative source for the term's legal content.
Black's Law Dictionary gives the briefest entry, treating the term as self-explanatory once the Roman law context is assumed. Rapalje & Lawrence adds the companion term *patruus major* (great-granduncle), which neither Black's nor Burrill includes under this heading, making Rapalje & Lawrence the most complete source for the full terminological series despite its corrupted typesetting.
None of the three sources addresses how or whether American courts applied the term in practice, nor do any of them cross-reference the cognate terms for the maternal line (*avunculus magnus* for a maternal granduncle). Researchers needing the full Roman kinship grid will need to consult the Digest directly or a dedicated treatise on Roman law or the canon law of consanguinity.
Jurisdictional Note
The term has no operative significance in modern American or English law, where statutes define intestate succession without reference to Roman kinship nomenclature. It retains relevance in Louisiana, Quebec, and other civil law jurisdictions as a matter of historical legal vocabulary, and in any jurisdiction where a historical instrument or judgment must be interpreted using the terminology current at the time of drafting.