Definition
An apoorisarius (also rendered apocrisarius) was an ecclesiastical officer performing several related functions in medieval church and imperial administration. The term encompasses:
1. A respondent or representative who formally answered on behalf of another, particularly in ecclesiastical proceedings.
2. An imperial messenger-officer responsible for carrying communications between church authorities and the emperor, and returning the emperor's answers to petitioners — a role combining diplomatic courier with administrative intermediary.
3. An advisor on questions of ecclesiastical law, consulted by officials or petitioners requiring authoritative guidance on church legal matters.
4. An ambassador or legate of a pope or bishop, representing that authority's interests in dealings with secular or other ecclesiastical powers.
A specialized variant, the apocrisarius cancellarius, held charge of the royal seal in the civil law tradition — a custodial and authenticating function rather than a diplomatic one.
Common Confusion
The several functions bundled under this term are easily conflated. The role of imperial messenger-officer is distinct from the role of papal or episcopal legate: the former served the emperor's administrative relationship with the church, while the latter represented the church's authority outward. Researchers should not assume that every appearance of the term in historical sources refers to the same office or carries the same authority. Context — whether the source is imperial, papal, or canonical — determines which function is meant.
Why It Matters in Research
This term appears almost exclusively in historical ecclesiastical and civil law sources. Researchers encountering it in medieval or early modern documents should treat it as a term of institutional art specific to the administrative structures of the late Roman Empire and the early medieval church. Its meaning shifts depending on the institutional context: an apoorisarius in a papal document likely denotes a legate or diplomatic representative, while the same term in an imperial administrative text more often refers to the messenger-officer function.
Because the office predates the systematic codification of canon law and overlaps with both secular imperial administration and church governance, the term does not map cleanly onto any modern legal role. Corpus researchers should be alert to variant spellings — apocrisarius, apocrisiarius, apocrisary — which are more common in Latin ecclesiastical sources than the Anglicized form appearing in Black's. Cross-referencing entries on ecclesiastical offices, legates, and the history of canon law will be necessary for full context. The term is essentially extinct in modern legal usage and will not appear outside historical or comparative ecclesiastical law discussions.
Historical Dictionary Support
Black's Law Dictionary (2nd Ed.) is the primary dictionary source for this term in the Law Mind corpus, drawing on Spelman's Glossarium Archaeologicum, a standard reference for medieval Latin legal and ecclesiastical terminology. Black's entry is brief and synthesizing, collapsing distinct historical functions into a single definition without distinguishing their chronological or institutional development.
What the historical dictionary record does not supply: any discussion of how the office evolved across the centuries from its late Roman origins through the Carolingian period, when the apocrisarius at the Frankish court became a significant figure in church-state relations. Nor does Black's distinguish between Eastern and Western variants of the office — the role in the Byzantine imperial court differed in important respects from its Carolingian or papal counterparts. Researchers requiring that depth will need to go beyond legal dictionaries to ecclesiastical histories and specialized studies in medieval institutional history.
The truncated entry for apocrisarius cancellarius — the text breaks off at "royal se" — suggests Black's was drawing on a longer source passage. The custodial-of-the-seal function this officer held is substantively different from the diplomatic functions of the main office and deserves separate investigation when encountered in source documents.
Jurisdictional Note
This term has no modern jurisdictional application. It is a historical term of ecclesiastical and civil law, relevant only to research into medieval church governance, the history of canon law, or the administrative structures of the late Roman and early medieval periods.