Definition
In old Scots law, a minor administrative officer responsible for the execution of summons — that is, the formal delivery of legal process compelling a person to appear before a court or authority. The marus functioned as a messenger or process server acting under royal authority. The office was also called the præco regis, meaning the king's herald or crier.
The term is Latin in form but refers to a distinctly Scottish legal institution, likely derived from the French "maître" (master) adapted into the administrative vocabulary of medieval Scots law.
Common Confusion
The Latin word "marus" also appears in classical sources as the name of a river in Dacia (the modern March or Morava), referenced in Tacitus and Pliny. This geographic usage has no connection to the legal term. Researchers encountering "marus" in classical Latin texts are reading about a river; researchers encountering it in Scottish legal records are reading about a process-serving officer. The two terms share spelling but no meaning or lineage relevant to legal research.
Why It Matters in Research
This term is a historical relic of medieval Scots administrative law and will appear almost exclusively in early Scottish legal records, charters, or commentaries drawing on John Skene's glossary of Scots legal terminology. Researchers working in pre-Union Scottish legal history — particularly in records involving service of process, court summons, or royal administrative officers — may encounter it.
The practical trap: because the office is obscure and the Latin form unusual, modern indexing of historical Scottish records may not consistently flag the term. Researchers should cross-reference under "præco regis" (the Latin alternative name given in all three source dictionaries) and under Scottish variants of "maître" or "maire" when searching manuscript sources or early printed legal texts.
No modern legal system uses this term operationally. Its research value is purely historical and interpretive — useful for identifying an officer's role and authority when the term appears in a document, not for constructing any current legal argument.
Historical Dictionary Support
All three source dictionaries — Black's (1st and 2nd editions) and Burrill's — agree entirely on the definition, citing the same single authority: John Skene's De Verborum Significatione, the foundational Scots law glossary first published in 1597. This unanimity reflects the narrow, antiquarian nature of the term rather than broad doctrinal consensus. None of the dictionaries expand on the officer's specific duties, jurisdiction, or relationship to other process-executing officials of medieval Scots law. Burrill provides the fullest citation form ("Skene de Verb. Signif."), confirming the source.
The definition equating marus with "maire" suggests a French-influenced administrative tradition consistent with the Norman and Continental influences on Scottish legal institutions in the medieval period, though none of the dictionaries develop this point.
What the historical dictionaries miss: no dictionary addresses whether the marus was a royal appointment, a local officer, or a court-attached functionary; whether the office had civil as well as criminal jurisdiction; or how it related to comparable officers in contemporary English or continental systems. Researchers needing that context will need to go directly to Skene or to secondary historical scholarship on medieval Scots administration.
Jurisdictional Note
Exclusively a term of old Scots law. It has no counterpart in English common law and does not appear in post-Union British legal practice. Researchers working in comparative medieval process law may find loose analogies to the English "summoner" or the French huissier, but no formal equivalence is established in the source literature.