Definition
Letters of request is a term with two distinct legal meanings that have operated largely in separate legal traditions.
1. In English ecclesiastical law (historical): A formal instrument by which the judge of an inferior ecclesiastical court waives or remits that court's own jurisdiction in favor of the next superior appellate court, requesting that the superior court take cognizance of a matter originally within the inferior court's primary jurisdiction. The practical effect was to permit a suit to begin in the Court of Arches — the principal appellate court of the Province of Canterbury — rather than proceeding first through the consistory court. Letters of request could only be directed to the immediately superior court; they could not leap over an intermediate appellate court, except by specific legal provision. Once the superior court accepted the letters, a decree issued under its seal calling the defendant to appear before it.
2. In international civil procedure (modern usage): A formal judicial communication by which a court in one country requests a court or competent authority in another country to perform a specified judicial act — most commonly, the taking of evidence from a witness located abroad, or service of process on a person in the foreign jurisdiction. In this sense, letters of request is used synonymously with letters rogatory, though letters of request has become the preferred term under the Hague Convention on the Taking of Evidence Abroad in Civil or Commercial Matters (1970), which formally adopted that phrase in its operative text.
Common Language
Wiktionary defines letters of request as a synonym of letters rogatory. There is no meaningful common-language usage of this phrase outside of legal contexts.
Editorial note: Both terms — letters of request and letters rogatory — are pure legal jargon. The practical difference between them today is terminological convention rather than substantive legal meaning, but the choice of phrase can signal which legal framework applies. See COMMON CONFUSION below.
Common Confusion
Letters of request and letters rogatory are frequently treated as interchangeable, and for most practical purposes they are. The distinction worth knowing for research purposes is this: letters rogatory is the older, traditionally dominant term in American federal practice and pre-Hague Convention sources; letters of request is the term adopted by the Hague Evidence Convention (1970) and tends to appear in sources and jurisdictions that operate within that treaty framework. Researchers should not assume that a source using one term rather than the other is referring to a different legal instrument — but they should note which framework the source is working within, because the procedural rules and permissible scope of the request differ between treaty and non-treaty channels.
The ecclesiastical meaning (definition 1 above) shares the same phrase but describes an entirely different instrument — a domestic jurisdictional transfer mechanism with no international dimension. Historical sources, particularly English ecclesiastical law materials, use the phrase exclusively in this first sense.
Why It Matters in Research
The single most important navigational fact about this term is that it carries two unrelated meanings across different bodies of law, and historical dictionaries document only the ecclesiastical meaning. A researcher working in international civil procedure who encounters letters of request in a pre-twentieth-century English dictionary entry will find no useful guidance on the modern treaty-based meaning. The term's migration into international procedural law occurred largely through the drafting of the Hague Evidence Convention, and the shift is not reflected in older secondary sources.
For corpus researchers working in ecclesiastical law materials: the ecclesiastical meaning is governed by a specific procedural logic — letters of request lie only where an appeal would lie, and only to the next immediate court. This rule appears consistently across Bouvier, Black, and Burrill, and is a useful diagnostic marker when reading old ecclesiastical court records or treatises. Understanding this rule prevents misreading historical documents that reference letters of request as though they describe an international instrument.
For corpus researchers working in international litigation materials: the Hague Evidence Convention is the controlling framework for most modern usage. The Convention's use of letters of request rather than letters rogatory was a deliberate terminological choice, and post-1970 secondary sources tend to follow it. Pre-Convention American federal court materials and treatises predominantly use letters rogatory. Researchers should adjust search terms accordingly when working across different time periods.
Jurisdictional variation is significant: not all countries are parties to the Hague Evidence Convention, and even among parties, implementation varies. This affects both the terminology used in local sources and the procedures available in practice.
Historical Dictionary Support
The four historical dictionaries in the Law Mind corpus are in close agreement on the ecclesiastical meaning, and all four treat that as the primary or exclusive meaning of the term. Black's, Bouvier's, and Burrill's each explain the instrument as a waiver of inferior court jurisdiction directed to the next superior ecclesiastical court, with the Court of Arches as the paradigm destination. Rapalje & Lawrence adds the procedural detail that upon the superior court's acceptance, a decree issues calling upon the defendant to appear — a useful supplement to the other entries, which describe the instrument but not the full procedural sequence.
Bouvier's adds an important doctrinal limitation that the other entries state less precisely: letters of request lie only where an appeal would lie and only to the next immediate court of appeal. This limitation is doctrinally significant and worth flagging for researchers reading historical ecclesiastical records.
None of the four historical dictionaries address the modern international procedural meaning. This is expected given their dates of composition, but it means the historical shelf is of limited direct use for researchers working with letters of request in the context of international litigation or the Hague Convention framework.
Jurisdictional Note
In the United States, both letters rogatory and letters of request are used in international civil practice, with federal courts historically preferring the former term. The Hague Evidence Convention (to which the United States is a party) uses letters of request as the operative phrase, and this convention applies between signatory states. For non-signatory states, letters rogatory through diplomatic channels remain the primary mechanism. Researchers should identify which channel a document is operating under before assuming procedural equivalence.