Definition
Rationabili parte (Latin: "of his reasonable part") is an archaic common-law writ used to compel the distribution of a deceased person's personal estate to those entitled to a proportionate share under the customary law of inheritance and distribution. The writ lay in favor of a widow or children — and in some formulations, other next of kin — against an executor or administrator who withheld their rightful portion of the decedent's movable goods and chattels.
Under the customary rules operative in much of medieval and early modern England, a deceased man's personal estate was divided into three equal parts: one for the widow, one for the children, and one the decedent could freely dispose of by will (the "dead's part"). Where an executor failed or refused to deliver the widow's or children's share, rationabili parte provided a remedy at common law to recover it. The writ belongs to the family of writs of right — instruments commanding a court to do right to the plaintiff — and its proper classification is as a real action in the older sense, directed toward the vindication of a recognized entitlement rather than damages for a wrong.
Why It Matters in Research
Researchers will encounter rationabili parte primarily in the context of medieval and early modern English probate, ecclesiastical court practice, and the history of intestate succession. Several navigational points are worth noting.
First, the writ's practical operation was largely displaced by ecclesiastical jurisdiction over testamentary and intestate matters long before the modern era. By the time English common-law commentators were systematizing writs, rationabili parte was already treated as obsolete or nearly so. Researchers should not expect to find it in regular use in reported cases from the seventeenth century onward.
Second, the custom of tripartite division it enforced was not uniform across England. It was recognized in certain regions — notably the Province of York, London, and Wales — but had been abolished or fallen into desuetude elsewhere. Bracton, Glanvill, and later Blackstone each address the distribution of personalty on death, but their accounts reflect regional variation and historical layering. When a source invokes rationabili parte, it is worth identifying the jurisdiction within England being discussed.
Third, the writ appears in early writ registers and in treatises on the forms of action. Researchers using Fitzherbert's Natura Brevium or older abridgments will find it catalogued there. Its presence in a source signals engagement with the pre-modern English writ system and the customs governing family property on death — material that connects to broader research on dower, curtesy, and the ecclesiastical probate regime.
Fourth, American legal materials will not contain this writ in operative use. Any American reference is antiquarian or comparative. It did not transplant into the colonial or early national legal systems in any active form.
Historical Dictionary Support
Rapalje and Lawrence describe rationabili parte as "an old writ of right for lands, &c." The characterization as a writ of right is broadly consistent with its function — it asserted an entitlement and commanded that right be done — though its subject matter was personal property rather than freehold land in the strict sense. The ampersand ("&c.") in their entry signals awareness that the writ's scope was understood to extend beyond land to goods and chattels, which is the more accurate description of its primary application. Their entry is sparse and offers no procedural detail, which is characteristic of how this writ is treated across the historical dictionaries: it is recognized, catalogued, and left largely undiscussed because it had long ceased to have practical significance by the time most legal dictionaries were compiled. No substantial divergence among historical sources exists on the core meaning, but the historical record uniformly underserves the writ's procedural and regional dimensions.
Jurisdictional Note
Rationabili parte is English in origin and had no recognized parallel in American or other common-law jurisdictions as an operative writ. Researchers working in Scottish, Irish, or Welsh legal history may encounter related customs of division of moveables on death, but the specific writ form is English.