Definition
"De cy en avant" is a Law French phrase meaning "from now henceforth" or "from this time forward." It appears in medieval English legal instruments and statutes as a temporal marker signifying that a rule, obligation, or prohibition takes effect from the present moment and continues into the future. The phrase functions as a prospective operative word, fixing the point at which a legal directive begins to run without retrospective application.
Why It Matters in Research
Researchers working with pre-modern English statutes, plea rolls, or chancery records will encounter this phrase primarily as a term of temporal limitation. Its significance is structural rather than substantive: when a statute or writ uses "de cy en avant," it signals that the provision governs future conduct only, not past acts. This has interpretive consequences — a court construing such an instrument would understand it to impose no liability or obligation for anything done before the instrument's effective moment.
The phrase belongs to the Law French stratum of English legal vocabulary, which dominated royal writs, statutes, and Year Book reporting from roughly the Norman Conquest through the seventeenth century. Researchers must recognize that Law French terms like this one are not French in any living linguistic sense; they are a specialized legal dialect with fixed meanings that sometimes diverge from continental French equivalents. Cross-referencing with Latin equivalents (such as "de cetero," meaning "henceforth" or "for the future") is often productive when working across document types, since Latin and Law French appeared side by side in the same corpus of instruments.
The Burrill citation to Articuli super Cartas, chapter 1, is significant. Articuli super Cartas (1300, 28 Edward I) was a statute confirming Magna Carta and the Forest Charter, with additional articles regulating royal officers. Identifying "de cy en avant" in that statutory context helps date and contextualize its usage. Researchers tracing the phrase in other medieval statutes should look for it in provisions that regulate ongoing conduct — market regulations, official duties, procedural rules — rather than in clauses that adjudicate completed transactions.
Because the phrase is purely adverbial, it rarely appears as a headword in modern legal indices and will not surface through keyword searches in contemporary legal databases. Successful retrieval requires searching within digitized Year Books, the Statutes of the Realm, or rotuli parliamentorum using the original Law French spelling, which itself varies (de cy, deci, de cy en avant, de ceo en avant).
Historical Dictionary Support
Burrill's Law Dictionary provides the only dictionary treatment in the Law Mind corpus. The entry is minimal — a translation and a single statutory citation — consistent with Burrill's general treatment of Law French particles, which he renders accurately but briefly. No broader legal context or doctrinal elaboration is offered, which reflects the nature of the term: it is a grammatical operator in legal drafting, not a substantive legal concept requiring extended definition.
Historical dictionaries of Law French more generally, such as Rastell's Termes de la Ley and the glossaries appended to later editions of Coke's Institutes, treat similar temporal phrases without always distinguishing their precise operative scope. Researchers should not assume that all "henceforth" language in early statutes carries identical legal weight; context within the instrument controls whether the prospectivity is absolute or qualified.
No significant divergence among historical sources exists here because the phrase's meaning is narrow and stable.