Definition
A compertorium is a report produced by a judicial inquest conducted through delegates or commissioners appointed to investigate a matter and relate the truth of a cause to the court or authority that commissioned them. The term belongs to the civil law tradition and describes both the process of delegated factual inquiry and the written record that results from it.
Why It Matters in Research
This term appears almost exclusively in historical legal sources dealing with ecclesiastical courts, canon law proceedings, and civil law matters in England before and during the period of Reformation-era church court reform. Researchers encountering the term in primary sources — particularly records of visitations, ecclesiastical inquiries, or proceedings in courts operating under Roman or canon law influence — should understand that a compertorium is the documentary output of a delegated investigation, roughly analogous to a modern commissioner's report or special master's findings, but arising within a civilian procedural framework.
The most important navigational point: this term does not appear in common law sources in any functional sense. If you encounter it in an English legal record, you are almost certainly looking at an ecclesiastical court document, a record of a church visitation, or a source that draws on civilian procedure. Burrill's citation to Kennett's Parochial Antiquities (a work on English church history and parish administration) confirms that the term's practical habitat in English sources is ecclesiastical and antiquarian rather than common law. Rapalje & Lawrence similarly cite Parochial Antiquities, reinforcing this research context.
Note also that Bouvier's entry runs the compertorium definition directly into the separate entry for comperuit ad diem — a common formatting artifact in older dictionary editions where entries bleed together. Researchers using digitized versions of Bouvier should be alert to this boundary confusion and not treat the bail bond pleading material as part of the compertorium definition.
Historical Dictionary Support
All five source dictionaries are in substantial agreement: a compertorium is a judicial inquest by delegates or commissioners to find out and relate the truth of a cause. The definitions are nearly identical across Black's (both editions), Bouvier's, Rapalje & Lawrence, and Burrill's, suggesting all draw from a common older source, likely Cowell's Interpreter or a related civilian law glossary. Burrill is the most informative of the group, adding the Latin derivation from comperire (to discover) and the specific citation to Kennett's Parochial Antiquities, which grounds the term in English ecclesiastical practice rather than purely abstract Roman law.
No source provides meaningful procedural detail about how a compertorium was constituted, what authority could commission one, or how findings were received and acted upon. The historical dictionaries treat the term as sufficiently self-explanatory to require only a sentence of definition. Researchers needing procedural depth will need to look beyond these dictionaries to treatises on canon law or ecclesiastical court practice.
Jurisdictional Note
The compertorium belongs to the civil and canon law traditions, not the English common law. Its practical relevance in English-language legal sources is largely confined to ecclesiastical court records and historical treatments of pre-Reformation and Reformation-era church administration.