Definition
Recto de rationabili parte (Latin: "writ of right of the reasonable part") was a historical common law writ of right used to recover a rightful share of land held in fee-simple among persons who were privies in blood — that is, co-heirs or coparceners related by blood. The writ lay between parties such as brothers holding land in gavelkind tenure, sisters, and other coparceners who were entitled to partitioned shares of inherited land but had been denied or dispossessed of their proportionate portion.
As a writ of right, it was among the most solemn and high-ranking forms of real action available at common law. Unlike possessory assizes, which addressed recent dispossession, this writ reached to the fundamental question of right and title to the land itself.
Why It Matters in Research
This term is a relic of the medieval English real actions system, which was substantially abolished by the Real Property Limitation Act 1833 and the Common Law Procedure Act 1852, with remaining writs of right finally extinguished in England. Researchers encountering this term in historical sources — case reports, plea rolls, yearbooks, or treatises predating the nineteenth century — should treat it as a marker of pre-reform English land law, not as a living procedural mechanism.
The key research trap is conflating this writ with the broader family of related writs. Recto de rationabili parte is specifically calibrated to disputes among blood privies over fee-simple land, distinguishing it from other forms of the writ of right that addressed different parties or different tenures. Rapalje & Lawrence direct the researcher to the related entry DE RATIONABILI PARTE, signaling that the substantive doctrine of reasonable share is the connecting thread across multiple writs.
Corpus researchers working in English legal history, gavelkind tenure, or the law of coparcenary will encounter this writ in proximity to discussions of partition, inheritance customs in Kent, and the mechanics of real actions. Because gavelkind tenure was a distinctive custom permitting equal division among male heirs (rather than primogeniture), this writ has particular relevance to sources dealing with Kentish land law and customary inheritance.
Researchers should also note that American legal sources referencing this writ are almost entirely derivative of English authority. The writ was never transplanted meaningfully into American colonial or early republic practice, as the real actions system was already in decline and most American jurisdictions moved quickly toward statutory partition remedies. References to recto de rationabili parte in American legal dictionaries and encyclopedias are definitional and historical rather than practical.
Historical Dictionary Support
Black's Law Dictionary (both the first and second editions) offer identical, terse definitions — a single sentence identifying the writ as one of right for the reasonable part, lying between blood privies including brothers in gavelkind and coparceners, for land in fee-simple. Both cite Fitzherbert's Natura Brevium at folio 9, the standard English treatise on the forms of writs, which remains the foundational primary source for understanding the writ's formal requirements and scope.
Rapalje & Lawrence take a cross-reference approach, directing the researcher to DE RATIONABILI PARTE for substantive treatment, and immediately pivot to the related writ RECTO QUANDO (or QUIA) DOMINUS REMISIT CURIAM in the same entry. This editorial choice reflects the compilers' view that the two writs are closely enough related to treat in sequence, and that the rationabili parte doctrine is best understood through the broader family entry.
None of the three historical dictionaries address the procedural mechanics of how the writ was prosecuted, the nature of the judgment it could deliver, or how it compared in practical use to the action of partition. Fitzherbert's Natura Brevium and Blackstone's Commentaries (Book III) provide fuller treatment for researchers requiring more than definitional coverage.
Jurisdictional Note
This writ is exclusively English in origin and application. It has no operative counterpart in American or other common law jurisdictions. Researchers in American legal history who encounter partition disputes among co-heirs should look instead to statutory partition actions, which displaced the real actions framework in virtually all American states during the nineteenth century.