Definition
A writ of entry available to a reversioner when a tenant in dower alienated the dowered land in fee or for life. The writ took its name from the Latin phrase appearing in its formal pleading — *quia non potest dedicere quin* — and was framed under the provisions of the Statute of Gloucester (6 Edw. I, c. 7). Its function was to restore the reversioner's right of possession following an unauthorized alienation by the dowress, an alienation that would otherwise have defeated the reversion upon her death.
The writ belongs to the broader family of writs of entry, which were the principal common law mechanism for recovering seisin of land wrongfully withheld. Within that family, the ocasu proviso was a specialized instrument: it did not challenge the original grant of dower but rather the subsequent act of the tenant in dower that exceeded her limited estate.
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Common Confusion
OCASU PROVISO should not be confused with writs of entry in the *per*, *per and cui*, or *post* — the standard degrees of entry used in ordinary land recovery actions. Those writs tracked the chain of wrongful transfer to determine how many removes from the original wrong the dispute had traveled. The ocasu proviso operated differently: the triggering event was not a disseisin in the usual sense but a specific statutory wrong — alienation by a tenant in dower beyond the scope of her estate. The Statute of Gloucester created the remedy because the common law writ structure did not neatly accommodate this situation.
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Why It Matters in Research
This term appears almost exclusively in historical legal sources concerned with medieval and early modern English land law. Researchers working in that corpus should be aware of several navigational points.
**Statutory anchor.** The writ is inseparable from the Statute of Gloucester (1278). Any research into the ocasu proviso must begin with that statute and its commentary. Secondary sources on the Statute of Gloucester — including Coke's treatment in his *Second Institutes* — are the most productive path into the doctrine.
**Writ of entry taxonomy.** The writs of entry constitute a large and internally differentiated family. Historical sources, including abridgments and register books of writs, organize these instruments in various ways, and the ocasu proviso may appear under the heading of writs of entry generally, under dower specifically, or under the Statute of Gloucester's provisions. Researchers should cast broadly when searching period indexes.
**Dower and reversion intersection.** The practical context is the life estate of a widow and the reversioner's interest — typically the heir of the deceased husband. This places the writ at the intersection of dower law and the law of reversions, two doctrinal streams that are treated separately in many historical sources. A researcher focused only on dower may miss the reversioner's remedy, and vice versa.
**Obsolescence.** The writ has been a dead letter in practice since the nineteenth-century reforms of English real property procedure, which swept away the old forms of real action. It has no modern procedural equivalent. American law never adopted it in operative form, though colonial-era courts occasionally referenced the underlying doctrine in dower disputes. Researchers working in American sources will rarely encounter this term outside of historical surveys or treatise discussions of English antecedents.
**Sparse coverage.** The ocasu proviso receives only passing treatment even in the major historical dictionaries. Its absence from later editions of Black's and from most American legal encyclopedias reflects its early obsolescence. Researchers should not assume that silence in American secondary sources means the writ lacked importance in its English context — it simply fell out of use before American legal literature had occasion to develop it.
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Historical Dictionary Support
Black's Law Dictionary (2nd Ed.) provides the only dictionary entry located in the Law Mind corpus. The definition is terse but accurate in its essential elements: it identifies the writ as a writ of entry, ties it to the Statute of Gloucester (6 Edw. I, c. 7), identifies the beneficiary as the reversioner, and identifies the triggering wrong as alienation by a tenant in dower in fee or for life. Nothing in this entry is inaccurate, but the brevity leaves the researcher without context about the writ's procedural operation, its relationship to other writs of entry, or its ultimate fate in legal history. Later editions of Black's omit the term entirely, consistent with the writ's obsolescence.
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Jurisdictional Note
This writ is a product of English common law and the specific legislative intervention of the Statute of Gloucester. It was never enacted or procedurally adopted as a distinct writ form in American jurisdictions. Research value in American legal contexts is limited to understanding historical English dower law and its indirect influence on early American land law doctrine.
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