Definition
Feudum apertum (Latin: "open fief") is a feudal law term denoting a fief that has reverted, or "opened," back to the lord upon the total extinction of the tenant's bloodline. Unlike ordinary escheat, which could occur for various reasons including attainder or failure of heirs in a limited sense, feudum apertum describes the specific condition in which the blood of the person last seised is utterly and completely extinct — no lineal or collateral heirs capable of inheriting remain. The fief, having no one to hold it, "opens" back to the grantor lord as if the original grant had run its course.
Common Confusion
The Rapalje & Lawrence entry for this term appears corrupted or conflated with text from an unrelated entry (possibly FIAT), rendering it unreliable as a standalone definition. Researchers should treat the Rapalje & Lawrence text with caution and rely on Blackstone and Black's for substantive content. Additionally, feudum apertum is sometimes loosely equated with escheat generally, but the distinction matters: escheat encompassed several triggering events (attainder, failure of heirs of a particular class), while feudum apertum specifically required the total extinction of blood — a narrower and more absolute condition.
Why It Matters in Research
This term appears almost exclusively in historical sources dealing with English feudal tenure and will rarely surface in American legal materials, where the feudal system was formally rejected and escheat was reconstituted on statutory grounds. Researchers working in pre-1800 English property law, colonial land grant disputes, or the history of tenure will encounter it in treatises and commentary rather than in reported cases.
The primary navigational trap is the corrupted Rapalje & Lawrence entry, which splices text from a different definition and cannot be used to reconstruct the term's meaning independently. Black's citation to 2 Bl. Comm. 245 is the authoritative anchor; Blackstone's Commentaries on the Laws of England, Book II, is the essential primary source for understanding feudum apertum in its doctrinal context, distinguishing it from related concepts such as escheat propter defectum sanguinis and forfeiture.
Researchers should also be alert to variant spellings and Latin forms in manuscript and early print sources: feudum apertum, feodum apertum, and feud ouvert may all appear, and indexing in historical compilations is inconsistent. The term is a marker of feudal vocabulary that signals a document or treatise working within the classical common law of real property before the Tenures Abolition Act 1660 substantially dismantled military tenure in England.
Historical Dictionary Support
Black's Law Dictionary provides the cleaner and more reliable definition, citing Blackstone directly. The entry is compact but sufficient: a fief reverting to the lord upon total extinction of the blood of the last tenant seised. Blackstone himself uses the term within his broader taxonomy of how feudal estates could end, placing feudum apertum alongside escheat as mechanisms by which land returned to the superior lord.
Rapalje & Lawrence's entry is, for practical purposes, unusable in its present form — the text is an apparent printing or compilation error that merges content from a separate entry. This is not an instance of meaningful divergence between the dictionaries; it is a source defect. No synthesis between the two is possible on this term.
Neither dictionary contextualizes the term within the broader decline of feudal tenure or its relationship to American property law, which is unsurprising given the term's purely historical scope. Researchers needing fuller treatment should consult Blackstone's Commentaries directly, as well as Digby's History of the Law of Real Property or Pollock and Maitland's History of English Law for scholarly analysis of how feudal reversion doctrines operated and eventually dissolved.
Jurisdictional Note
Feudum apertum has no operative application in American law. The feudal tenure system from which it derives was not transplanted to the American colonies in functional form, and post-independence property law displaced any residual feudal concepts. The term is relevant only in historical and comparative research contexts, or in analysis of early colonial land grants that employed feudal grant language.