LINEA RECTA

Definition

Linea recta (Latin: "right line" or "direct line") is a civil law term designating the vertical line of descent and ascent connecting a person directly to their ancestors and descendants. It encompasses progenitors and their offspring in an unbroken chain — grandparent to parent to child to grandchild — as opposed to collateral relatives such as siblings, cousins, or aunts and uncles. Persons within the linea recta are either ascendants (those from whom a person descends, such as parents and grandparents) or descendants (those who descend from the person, such as children and grandchildren). The relationship is direct: one member of the line either springs immediately from another, or mediately through an intermediate member of the same line. The concept is foundational to computing degrees of kindred under civil law rules and determines succession to estates, inheritance priorities, and in historical contexts, the degree of consanguinity relevant to questions of intestate distribution, guardianship, and prohibited degrees of marriage.

Common Confusion

Linea recta is frequently distinguished from linea transversalis (or linea obliqua) — the collateral or transverse line connecting persons who share a common ancestor but do not descend from one another. The collateral line covers siblings, cousins, uncles, aunts, and nephews. Researchers consulting historical sources on intestate succession or consanguinity must be careful: a source discussing "degrees" in the direct line is computing distance very differently than one computing degrees in the collateral line, and the two methods of counting do not produce equivalent numbers.

Why It Matters in Research

Linea recta appears almost exclusively in sources drawing on Roman civil law or the canon law tradition, and its practical importance in Anglo-American research is largely historical. Researchers encounter it most often in: Early English property and succession law. Bracton and Fleta both use the term when explaining the rules governing inheritance of land. A researcher working in medieval or early modern English property law will find linea recta operating as a structural concept underlying descent rules that later common law absorbed without retaining the Latin terminology. Civil law jurisdictions and Louisiana. In American research, linea recta remains live doctrine in Louisiana, which inherited its succession framework from French and Spanish civil law. Researchers working on Louisiana successions, forced heirship, or legitime must understand the direct/collateral line distinction as an organizing principle, not merely an antique label. Degrees of consanguinity. The civil law method of computing degrees — counting steps up to the common ancestor and back down — differs from the canon law method used in some ecclesiastical and early common law contexts. Within the linea recta, the civil law count is straightforward: each generation is one degree. This affects how historical documents characterize inheritance rights and prohibited marriages. Trap for researchers: Rapalje & Lawrence's entry for linea recta is truncated in a way that splices in unrelated collision-law material. Researchers consulting that source should be aware that the entry does not fully address the term and should cross-reference Burrill and Black for complete coverage.

Historical Dictionary Support

The three shelf sources converge on the core meaning without meaningful disagreement. All three identify linea recta as the direct line of persons in which each is descended mediately or immediately from another. Burrill provides the richest classical grounding, citing Bracton (fol. 67) and Fleta (lib. 6, c. 1, § 11) as well as Mackeldey's Civil Law and the Elementa Juris Civilis. His inclusion of the defining Latin phrase — quae genitores et genitos complectitur ("which embraces progenitors and those begotten") — is the most precise formulation and helpfully distinguishes the linea recta from collateral relationships by its internal logic: the line exists only among those who stand in a generative relationship to one another. Black's draws on Mackeldey (Roman Law, § 129) and notes the operational consequence: persons in the direct line are called ascendants and descendants. Black's is the most accessible of the three for a common law researcher but provides the least classical depth. Rapalje & Lawrence's entry is essentially incomplete as it appears in the source material, with the definition cut off and followed by unrelated material on maritime collision law. It adds little independent value for this term. None of the three historical dictionaries address modern statutory succession codes or the term's persistence in civil law jurisdictions. Researchers should not assume that the civil law framework described by Mackeldey maps directly onto the positive law of any particular jurisdiction without consulting current sources.

Jurisdictional Note

In common law jurisdictions, linea recta survives primarily as historical vocabulary; modern statutes use "lineal descendants," "lineal ancestors," or simply "descendants" and "ancestors." In Louisiana and other civil law or mixed jurisdictions, the direct/collateral line distinction remains structurally operative in succession law and may appear by name or functional equivalent in statutory and case authority.

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