Definition
De pace et legalitate tuenda (Latin: "for keeping the peace and maintaining good behavior") is a historical legal phrase designating a class of writs and judicial proceedings by which a court compelled a person to give security — typically in the form of sureties or a bond — guaranteeing their future peaceable conduct and law-abiding behavior. The phrase functions both as a descriptive label for the underlying obligation and as a shorthand reference to the formal process by which that obligation was enforced.
The complete phrase is properly de pace et legalitate tuenda, with tuenda (meaning "to be kept" or "for keeping") supplying the operative verbal element. In practice, the abbreviated form de pace et legalitate appears in writs, pleadings, and early legal commentary to identify proceedings concerned with the dual requirement of peace and legal regularity of conduct — what later common law would consolidate under the heading of sureties of the peace and good behavior.
Common Confusion
De pace et legalitate tuenda should not be conflated with the writ de pace (or surety of the peace standing alone), which addressed only the immediate threat of breach of the peace without the additional component of general good behavior. The full phrase encompasses both peace-keeping and broader lawful conduct, making it a wider obligation than simple surety of the peace. Researchers encountering the abbreviated form should check the surrounding context to determine whether the good-behavior element is also implicated.
Why It Matters in Research
This phrase appears almost exclusively in early common law materials — Year Books, Fitzherbert's Natura Brevium, Coke's commentaries, and the Registrum Brevium — and surfaces rarely after the consolidation of surety-of-the-peace and good-behavior proceedings into recognizance practice in the sixteenth and seventeenth centuries. Researchers should be alert to two navigational issues.
First, the phrase is a heading or caption term rather than a stand-alone writ name. Primary sources may use it to organize a discussion of multiple related writs rather than to designate a single discrete remedy. When Bouvier's entry for de pace et legalitate tuenda appears in connection with de parco fracto and similar phrases, this reflects the Registrum Brevium's organizational convention of grouping writs by subject matter, not a suggestion that the terms are synonymous.
Second, the legalitate component (good behavior) connects this phrase directly to the medieval and early modern law of mainprise, recognizances, and the justice of the peace's power to bind over. A researcher tracing the history of bind-over powers, preventive justice, or pre-trial detention will find de pace et legalitate tuenda at the root of that lineage, even though later sources drop the Latin phrase in favor of "surety of the peace," "good behavior bond," or simply "recognizance." The phrase thus serves as a corpus entry point into a much larger body of preventive and public-order law.
Historical Dictionary Support
Bouvier's Law Dictionary records the phrase under the heading de pace et legalitate tuenda and translates it as "for keeping the peace, and for good behavior," which is accurate and sufficient for identification purposes. Bouvier's treatment is minimal — the entry functions as a cross-reference anchor rather than a substantive discussion — and it does not distinguish between the peace component and the legalitate (good behavior) component as legally distinct obligations, which they were in classical common law practice.
Earlier authority is more instructive. Fitzherbert's Natura Brevium and the Registrum Originale treat the subject in connection with writs compelling sureties, and Coke's Institutes elaborate the distinction between surety of the peace (requiring security against specific threatened harm) and good behavior (a broader prospective obligation covering general lawful conduct). Black's Law Dictionary in its early editions does not carry a standalone entry for this phrase, routing researchers instead through entries on sureties and recognizance. This gap in the modern dictionary record makes Bouvier's entry — sparse as it is — the most accessible single-volume identification of the phrase for common-law corpus research.
No historical legal dictionary source available here provides a full substantive treatment. Researchers needing depth should move directly to Fitzherbert, the Registrum Brevium, and Hawkins's Pleas of the Crown for the procedural mechanics.
Jurisdictional Note
De pace et legalitate tuenda is a term of English common law and has no direct American statutory counterpart. Its functional descendants — recognizance to keep the peace, good behavior bonds, and bind-over orders — vary considerably in availability and procedure across American jurisdictions and were substantially modified or abolished in many states during nineteenth-century procedural reform.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Sureties of the Peace; Recognizance; History of Preventive Justice and Bind-Over Powers.