Definition
De fet is a Law French phrase meaning "of fact" or "in fact." It is the Anglo-Norman antecedent of the Latin de facto, carrying identical substantive meaning: a state of affairs that exists as a practical reality, regardless of whether it has been formally established or legally recognized. In medieval English legal practice, de fet appeared in pleading and judicial records to distinguish factual existence or actual conduct from legal right or formal status.
The phrase is encountered almost exclusively in historical sources — year books, early treatises, and texts drawing on the Law French vocabulary of English common law before Latin and then English displaced French as the language of legal record.
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Common Confusion
De fet and de facto are not competing terms but successive ones. De fet is the Law French form; de facto is its Latin equivalent. Researchers encountering de fet in a historical source should understand it as functionally identical to de facto in any modern legal analysis. The confusion arises when a researcher unfamiliar with Law French treats de fet as a distinct doctrine or concept rather than recognizing it as a linguistic variant. No separate body of law attaches to de fet itself — the substantive legal content lives under de facto and its developed doctrines.
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Why It Matters in Research
De fet matters in research almost entirely as a reading and translation problem. Researchers working in year books, plea rolls, or early English legal records will encounter Law French frequently, and de fet is one of the more common phrases in that register. Misreading it, or failing to connect it to its modern de facto equivalent, can cause a researcher to miss the doctrinal thread running through a source.
The phrase appears in Burrill citing Year Book Pasch. 2 Edw. II, placing it firmly in early fourteenth-century usage. Researchers tracing the history of de facto doctrines — whether in corporate law (de facto corporations), family law (de facto parentage), or standards of review (de facto versus de jure distinctions) — should search historical sources under de fet, en fait, and related Law French forms, not only under de facto.
Burrill also pairs the entry with the maxim De fide et officio judicis non recipitur quaestio, sed de scientia, sive sit error juris, sive facti — "Concerning the fidelity and official conduct of a judge, no question is entertained; but only concerning his knowledge, whether the error be of law or of fact." This maxim, drawn from Bacon's Maxims of the Law, is substantively important: it encodes the principle that judicial integrity is presumed, and that appellate scrutiny is confined to whether a judge erred in law or in knowledge of fact, not whether the judge acted in good faith. Researchers working on appellate standards of review or judicial immunity will find this maxim relevant, and its presence in the de fet entry reflects how closely the fact/law distinction was bound up with Law French vocabulary in early common law thinking.
The Law French corpus in Law Mind connects de fet directly to the broader de facto family of doctrines that remain active in modern law. Researchers should follow that thread forward through the encyclopedia entries on de facto corporations and de facto parentage to trace how a medieval pleading term became the foundation for several distinct modern legal tests.
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Historical Dictionary Support
Burrill's Law Dictionary provides the primary entry, defining de fet simply as "L. Fr. Of fact; in fact; (de facto)" and citing Year Book Pasch. 2 Edw. II at page 36. Burrill's treatment is brief, as expected for a term that functions as a linguistic variant rather than an independent doctrine. His value here is confirmatory: he anchors the phrase in the year book record and signals its equivalence to de facto without elaboration.
Burrill extends the entry by incorporating the Baconian maxim on judicial error, which is the more substantively significant material in the entry. That maxim reflects the early common law's effort to separate the domain of fact from the domain of law — a distinction that would eventually generate the entire architecture of appellate review standards. Historical dictionaries generally do not develop this connection, treating de fet as a vocabulary item rather than a doctrinal marker. Researchers should not expect Black's or Bouvier's to add much; those dictionaries largely absorbed the concept into their de facto entries without tracing the Law French genealogy.
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Jurisdictional Note
De fet as a term of art is not jurisdiction-specific — it is a historical linguistic form that predates the divergence of common law systems across jurisdictions. Its modern functional equivalent, de facto, operates across all common law jurisdictions, though the specific doctrines that invoke the de facto concept (corporate formation, parentage, government authority) vary significantly by jurisdiction.
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Encyclopedia Cross-Reference
Corporate Formation — Defective Incorporation (De Facto, Corporation by Estoppel) (The Law Mind Business Organizations & Corporate Law Encyclopedia)
Paternity — De Facto Parent and Psychological Parent Doctrines (The Law Mind Family Law Encyclopedia)
Standards of Review on Appeal (De Novo, Abuse of Discretion, Plain Error) (The Law Mind Criminal Law Encyclopedia)
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