Law French is an archaic language originally based on Old Norman and Anglo-Norman, but increasingly influenced by Parisian French and, later, English. It was used in the law courts of England, beginning with the Norman Conquest by William the Conqueror. Its use continued for several centuries in the courts of England.
History of the language 
The earliest known documents in which French is used specifically as a vehicle for discourse on English law date from the third quarter of the thirteenth century. They are
- The Provisions of Oxford (1258), consisting of the terms of oaths sworn by the 24 magnates appointed to rectify abuses in the administration of King Henry III, together with summaries of their rulings.
- The Casus Placitorum (c. 1250–70), a collection of legal maxims, rules and brief narratives of cases.
In these works we see an already sophisticated technical language well equipped with its own terminology. This includes many words which are of Latin origin but whose forms have been worn down and distorted in a way which suggests that they already possessed a long history of French usage; examples include avoeson 'right of nominating a parish priest' (Latin advocationem), neife 'female serf' (Latin nativa) and essoyne or essone 'circumstance giving exemption from a royal summons' (Latin sunnis, later replaced by essonia which is simply a reintroduction into Latin from the French form).
Until the early fourteenth century, Law French largely coincided with the French used as an everyday language by the upper classes. As such, it reflected some of the changes undergone by the northern dialects of mainland French during the period. Thus, in the documents mentioned above, 'of the king' is rendered as del rey, whereas by about 1330 it had become du roi (as in modern French) or du roy. During that century, however, this vernacular French suffered a rapid decline; the Pleading in English Act 1362 ("Statute of Pleading") acknowledged this change by ordaining that thenceforward court proceedings be conducted in English, which eventually developed into Legal English. From that time, Law French lost most of its status as a spoken language. It remained in use for the 'readings' (lectures) and 'moots' (academic debates), held in the Inns of Court as part of the education of young lawyers, but essentially it quickly became a written language alone; it ceased to acquire new words, its grammar degenerated (by about 1500 gender was often neglected, giving rise to such absurdities as une home ('a (feminine) man') or un feme ('a (masculine) woman'), and its vocabulary became increasingly English, as it was used solely by English lawyers and judges who often spoke no real French.
In the seventeenth century, the moots and readings fell into neglect, and the rule of Oliver Cromwell, with its emphasis on removing the relics of archaic ritual from legal and governmental processes, struck a further blow at the language. Even before then, in 1628, Sir Edward Coke acknowledged in his preface to the First Part of the Institutes of the Law of England that Law French had almost ceased to be a spoken tongue. It was still used for case-reports and legal text-books until almost the end of the century, but only in an extraordinarily debased form. A frequently quoted example of this ultimate degeneracy comes from one of Chief Justice Sir George Treby's marginal notes in an annotated edition of Dyer's Reports, published 1688:
Richardson, ch. Just. de C. Banc al Assises at Salisbury in Summer 1631. fuit assault per prisoner la condemne pur felony que puis son condemnation ject un Brickbat a le dit Justice que narrowly mist, & pur ceo immediately fuit Indictment drawn per Noy envers le Prisoner, & son dexter manus ampute & fix al Gibbet, sur que luy mesme immediatement hange in presence de Court.—Sir George Treby
("Richardson, Ch(ief) Just(ice) of C(ommon) Bench at the Assizes at Salisbury in Summer 1631. There was an assault by a prisoner there condemned for felony; who, following his condemnation, threw a brickbat at the said Justice, which narrowly missed. And for this, an indictment was immediately drawn by Noy against the prisoner, and his right hand was cut off and fastened to the gibbet, on which he himself was immediately hanged in the presence of the Court.")
Survivals in modern legal terminology 
The post-positive adjectives in many legal noun phrases in English—Attorney general, fee simple—is a heritage from Law French. Native speakers of French may not understand certain Law French terms not used in modern French or replaced by other terms: for example, the current French word for "mortgage" is hypothèque. Many of the terms of Law French were converted into modern English in the 20th century to make the law more understandable in common-law jurisdictions. However, some key Law French terms remain, including the following:
|Term or phrase||Literal translation||Definition and use|
|assizes||sittings (Old French assise, sitting)||Sitting of the court held in different places throughout a province or region.|
|attorney||appointed (Old French atorné)||attorney-at-law (lawyer, solicitor, barrister or civil law notary) or attorney-in-fact (one who has power of attorney)|
|bailiff||from Anglo-Norman baillis, baillif, from bail "custody, charge, office"||1. Marshal of the court; a court attendant; any person to whom authority, guardianship or jurisdiction is entrusted whose main duty is keeping order in the courtroom.
2. A person employed by the sheriff to serve writs, execute court orders, and in some regions, make arrests. In some regions, the bailiff is bound to the sheriff with sureties for the proper execution of the office and is referred to as a Bound Bailiff.
|cestui que||abbreviation of cestui a que use le feoffment fuit fait, "The person for whose use the feoffment was made"||sometimes shortened to cestui; the beneficiary of a trust.|
|chattel||property, goods (Old French chatel, ultimately from Latin capitale)||personal property|
|chose||thing (from Latin causa, "cause")||thing, usually as in phrases: "chose in action" and "chose in possession".|
|culprit||Originally cul. prit, abbreviation of Culpable: prest (d'averrer nostre bille), meaning "guilty, ready (to prove our case)", words used by prosecutor in opening a trial.||guilty party|
|defendant||"defending" (French défendant)||the party against whom a civil proceeding is brought.|
|escheats||succession, inheritance (Anglo-Norman eschete)||Pre-1660: reversion of unclaimed property to a feudal lord, or the state where the property is allodial.
Post-1660: After the Tenures Abolition Act, 1660, which changed all tenures to free and common socage, the only revenue generating incidents that remained were escheat: whereby land returned to the Crown if a landholder died both interstate and heirless, and forfeiture, whereby land held by the grantee convicted of treason forfeited to the Crown
Present-day: The reversion of land to the Crown when a person possessed of the fee dies intestate (i.e., no will) and without heirs. Land seldom reverts to the Crown, because it is freely alienable by way of sale, will or inheritance. As long as the land is disposed of in one of these three ways it does not revert to the Crown.
|estop, estoppel||bung, block(age) (Old French estopper , estopail)||prevention of a party from contradicting a position previously taken.|
|force majeure||superior force||clause in some contracts that frees parties from liability for acts of God|
|laches||slackness, lassitude||Under English Common Law, the unnecessary delaying bringing an action against a party for failure to perform is known as the Doctrine of Laches. The doctrine describes that a court may refuse to hear a case not brought before it after a lengthy period since the right of action arose.|
|mortgage||dead pledge (Old French mort gaige)||a pledge by which the landowner remained in possession of the property he staked as security.|
|oyez||hear ye! (ultimately from Latin audiatis)||a traditional cry used to open court proceedings, still used in the Supreme Court of the United States.|
|parole||word, speech (ultimately from Latin parabola, parable)||the release of prisoners based on giving their word of honour to abide by certain restrictions.|
|plaintiff||complaining (from Old French plaintif)||the person who begins a lawsuit.|
|pur autre vie||in modern French; means during the term of another person's life||1) used in lease arrangements
2) In the rights and obligations of the freehold, an heir or tenant has the rights to emblements from the life estate in certain cases (i.e., life estate terminated by a death)
- autrefois acquit, a peremptory plea that one has previously acquitted of the same offence.
- cy-près doctrine, the power of a court to transfer the property of one charitable trust to another charitable trust when the first trust may no longer exist or be able to operate.
- feme covert and feme sole - the legal status of adult married women and unmarried women, respectively, under the coverture principle of common law.
- Estovers - wood that tenants may be entitled to from the land in which they have their interest
- Statutes of Mortmain - statute restricting the conveyance of land to the "dead hand" of a religious organization
- parol evidence rule, a substantive rule of contract law which precludes extrinsic evidence from altering the terms of an unambiguous fully expressed contract; from the Old French for "voice" or "spoken word," i.e., oral, evidence.
- prochein ami - Law French for what is now more usually called next friend. Refers to one who files a lawsuit on behalf of another not capable of acting on his or her own behalf, such as a minor.
- profit a prendre - also known as the right of common, where one has the right to take the "fruits" of the property of another, such as mining rights, growing rights, etc.
- recovery - originally a procedural device for clarifying the ownership of land, involving a stylised lawsuit between fictional litigants.
- remainder - originally a substitution-term in a will or conveyance, to be brought into play if the primary beneficiary were to die or fail to fulfil certain conditions.
- replevin, a suit to recover personal property unlawfully taken.
- torts, meaning wrongs.
- trove, as in treasure trove, was originally an adjective, not a noun, and meant found. Thus treasure trove means, in origin, not a treasure chest or hoard, but a treasure found by chance, as opposed to one stolen, inherited, bought, etc.
- voir dire - literally "to say the truth"; the word voir (or voire) in this combination comes from Old French and derives from Latin verum, "that which is true" and is not related to the modern French word voir, which derives from Latin vidēre ("to see"). Voir dire refers to the questions a prospective juror or witness must answer to determine his qualification to serve, in the law of England a mini-trial held after a plea of guilty has been entered to determine the facts of the offence where they are in dispute. In a modern context thought of often as a mini-trial within a full trial to determine the admissibility of contested evidence. In a jury trial a voir dire is held before the judge but without a jury present. Voir dires may also be held in a trial by judge alone, but done, of course, in the presence of the judge.
See also 
- French language
- Norman language
- French phrases used by English speakers
- Jersey Legal French
- List of legal Latin terms
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- Printed in William Stubbs, Select Charters illustrative of English Constitutional History (9th ed., ed. H.C.F. Davis) (Oxford, 1913), pp. 378 et seqq.
- W.F. Dunham (ed.), The Casus Placitorum and Cases in the King's Courts 1272–1278 (Selden Society, vol. 69) (London, 1952)
- [Many examples in] D.W. Sutherland (ed.), The Eyre of Northamptonshire, 3–4 Edward III, A.D. 1329–1330 (Selden Society, vol. 97–8) (London, 1983) [note however that this text also shows instances of rei or rey]
- Source: http://books.google.com/books?id=TI860GexMyIC&pg=PA283 . The macaronic nature of this production can be more easily seen if it is reproduced in a modernized form, with the French elements in italics, Latin in bold, and the rest in English: "Richardson, C. J. de C. B. at Assizes at Salisbury in Summer 1631. Fut assault par prisoner là condemné pour felony; que puis son condemnation jeta un brickbat au dit Justice, que narrowly missed, & pour ce immediately fut indictment drawn par Noy envers le prisoner, & son dexter manus amputée et fixée au gibbet, sur que lui-même immédiatement hangé in presence de Court." Admittedly, many of the English words (assault, prisoner, condemn, gibbet, presence, Court) could be interpreted as misspellings (or alternative spellings) of French words, while Justice is the same in French as in English; but even under the most favourable of constructions, the note is bad French, bad English, and bad Latin, all at the same time. What is perhaps most striking is that Treby could not remember the French even for such a familiar concept as being 'hanged' (pendu).
- Willes, John A; Willes, John H (2012). Contemporary Canadian Business Law: Principles and Cases (9th ed.). McGraw-Hill Ryerson.
- Yogis, John (1995). Canadian Law Dictionary (4th ed.). Barron's Education Series.
- Benson, Marjorie L; Bowden, Marie-Ann; Newman, Dwight (2008). Understanding Property: A Guide (2nd ed.). Thomson Carswell.