Definition
In the civil law, a great-great-aunt — specifically, the sister of one's great-grandmother. The term is Latin and belongs to the systematic nomenclature of Roman civil law kinship, which designated each degree of relationship through the female line with a distinct technical label. The promatertera magna stands one generation more remote than the promatertera (great-aunt), and two generations more remote than the matertera (aunt).
Common Confusion
PROMATERTERA MAGNA is easily confused with adjacent terms in the same kinship series. The promatertera is a great-aunt (sister of a grandparent), while the promatertera magna is a great-great-aunt (sister of a great-grandparent). A further degree, the abmatertera, extends the line one generation beyond even the promatertera magna. Researchers working with civil law succession materials should map these terms carefully before drawing conclusions about the degree of kinship asserted in any historical document.
Why It Matters in Research
This term appears almost exclusively in civil law succession and inheritance contexts, where precise degree of kinship governed rights to an intestate estate. In Roman law and the civil law traditions derived from it — including Louisiana, Quebec, and the mixed jurisdictions of Scotland and South Africa — the line of succession extended through collateral relatives to a degree that common law systems largely abandoned. A researcher encountering promatertera magna in a historical document is almost certainly reading a succession pleading, an inheritance dispute, or a civil law treatise attempting to identify a claimant's precise place in the table of consanguinity.
The term will not appear in English common law sources. Its presence in American legal dictionaries reflects the influence of civil law scholarship on nineteenth-century American legal education, not widespread use in American courts. Outside Louisiana and a handful of other civil law jurisdictions, the term is effectively a scholarly artifact.
Researchers working in Louisiana succession records should be alert to the full series of matertera terms, as civil law notarial practice sometimes employed the Latin nomenclature in formal instruments well into the nineteenth century. In those records, misreading or conflating promatertera with promatertera magna could misplace a claimant by an entire generation.
Historical Dictionary Support
Both Black's Law Dictionary and Rapalje & Lawrence define the term identically and briefly: a great-great-aunt. Rapalje & Lawrence append a citation to Jones v. Barkley, which appears in the context of civil law kinship exposition, though the citation is given without sufficient particularity in the source material to verify independently. Neither dictionary elaborates on the civil law framework from which the term derives or situates it within the broader table of consanguinity.
What the historical dictionaries omit is notable: neither explains the term's relationship to adjacent kinship labels, neither identifies the succession contexts in which the term would appear, and neither distinguishes it from the parallel paternal-line term (amita magna, the great-great-aunt on the father's side through a different genealogical path). For a researcher, these silences mean the dictionaries confirm the bare definition but provide no navigational assistance for actual source work.
Jurisdictional Note
The term is operative only in civil law jurisdictions or in scholarship drawing on Roman law. It carries no legal weight in common law jurisdictions. Louisiana is the primary American jurisdiction where civil law succession terminology retains practical relevance, though even there modern statutory language has largely displaced classical Latin nomenclature.