Definition
Decurionatus (Latin) refers to the office or rank of a decurio in Roman law. A decurio was a member of a municipal council (curia or ordo decurionum) in a Roman city or town. The decurionatus thus denotes both the status of holding that office and the tenure of membership in the local governing body. These councils were responsible for administering municipal affairs, levying local taxes, and carrying out the directives of the imperial administration at the local level. Membership was generally tied to property qualifications and carried significant civic obligations, including financial liability for the collection of taxes within the municipality.
Core Elements
Decurionatus as a legal status comprised several recognized dimensions:
Office: Membership in the ordo decurionum, the municipal senate of a Roman town or colony.
Qualification: Entry required meeting a property threshold; the office was hereditary in practice under the later Empire, as sons of decurions were typically bound to the same status.
Obligation: Decurions bore collective responsibility for local tax revenues and public duties (munera), making the office financially burdensome in the late Roman period.
Domicil Connection: Under Roman law, the decurionatus was treated as establishing or evidencing legal domicil in the municipality where the office was held — a connection central to its appearance in later legal scholarship on domicil.
Why It Matters in Research
Decurionatus surfaces in legal research almost exclusively in one specific context: the historical development of the doctrine of domicil. Phillimore's treatise on domicil, cited by Burrill, draws on Roman law principles to construct the common law understanding of domicil, and the decurionatus serves as a Roman-law analogue for the proposition that holding public office in a place could establish or confirm legal domicil there.
Researchers working in 19th-century private international law, conflict of laws, or the history of domicil doctrine will encounter this term in treatises that reach back to Roman sources for doctrinal grounding. The term is essentially inert in modern common law practice but appears as a building block in the scholarly apparatus of writers like Phillimore, Story, and Dicey when constructing the theoretical foundations of domicil.
A trap for the unwary: Burrill's entry for decurionatus is truncated and bleeds immediately into the entry for DEDEINS, a separate and unrelated Old French legal term. Researchers consulting the original dictionary text must be careful not to conflate these entries or treat the surrounding material as part of the decurionatus entry.
The term has no meaningful common law analog as an operative legal concept. Its research value is almost entirely historical and comparative — it illustrates how Roman municipal law addressed the legal consequences of public office and local attachment, a framework that later common law writers borrowed when articulating domicil rules.
Historical Dictionary Support
Burrill is the primary anglophone legal dictionary source for this term, and his entry is minimal: he defines decurionatus simply as "the office of a decurio" and cites Phillimore on Domicil as his authority. He provides no further elaboration.
This sparseness reflects the term's peripheral status in common law jurisprudence. Burrill's entry exists mainly to gloss a Latin phrase a reader might encounter in Phillimore or similar civilian-influenced treatises, not to develop the concept independently.
No significant divergence or evolution in the dictionary treatment of this term is traceable within the anglophone legal dictionary tradition, because the term never achieved sufficient currency to generate competing definitions. Its meaning in Roman law was stable: the office and status of a municipal councilor. What varied across later scholarly treatments was not the definition but the use to which the concept was put — primarily as evidence that Roman law recognized a domicil of public office, distinct from domicil of origin or choice.
Jurisdictional Note
Decurionatus is a term of Roman law with no direct application in any modern common law jurisdiction. It appears in Anglo-American legal literature solely through civilian-influenced treatises on domicil and private international law.