Definition
In old English law, the keeper, lord, or captain of a castle or fortified house. The term carried several overlapping functions depending on context: the castellain could be the owner of a castle in his own right, a constable or governor acting on behalf of an owner, or a royal officer entrusted with custody of one of the crown's fortified mansions. The role also extended to forest administration, where a castellain might hold authority over a designated forest precinct.
The Latin equivalents — castellanus, castellanius, and castellarius — appear interchangeably in medieval sources and carry substantially the same meaning. The French chastellain and Dutch castelein reflect the term's wide currency across feudal jurisdictions on both sides of the Channel.
Common Confusion
Castellain and castellanus are sometimes treated as distinct offices in medieval records, but English legal sources use them as synonyms. Researchers should not read substantive differences into which form appears in a given document; variation is orthographic and linguistic, not jurisdictional or functional. Burrill makes this point explicit by cross-referencing castellanus immediately after defining castellain.
Why It Matters in Research
This is primarily a term of medieval English feudal and forest law with no surviving operational significance in modern legal systems. Researchers encounter it almost exclusively in:
- Historical property records involving castle tenure and obligations attached to it
- Forest law materials, where the castellain's administrative role overlaps with that of the warden or steward
- Crown records concerning custody of royal fortifications
The key research trap is terminological fragmentation. Medieval and early modern sources scatter the term across multiple Latin and vernacular forms — castellain, chastellain, castellanus, castellanius, castellarius, castelein — without consistent preference. A search confined to one spelling will miss the others. Burrill's entry is the most useful starting point precisely because it gathers these variants and cross-references them.
A second trap: the term's overlap with constable. In castle contexts, the constable and the castellain often denoted the same officer, but constable acquired a far longer and more varied history in English law, eventually becoming generalized law enforcement terminology. Sources that describe a castellain exercising constabulary functions are not using constable in its modern sense.
Researchers working with Bracton, Coke's Institutes, or Termes de la Ley will find castellain used without extended definition, on the assumption of reader familiarity with feudal tenure structures. Modern readers require the feudal context to interpret these references correctly.
Historical Dictionary Support
The three shelf sources agree on all substantive points. Black's, Rapalje & Lawrence, and Burrill each identify the castellain as the keeper, lord, or captain of a castle, the constable of a fortified house, a custodian of crown mansions, and — in Black's and Rapalje & Lawrence — an officer of the forest.
Burrill is the most detailed, offering the Latin phrase præfectus castri (commander of the castle) and the clarifying note that the castellain acts domini vices ibidem agens — in the place of the lord. This distinction between owner and custodian-acting-for-owner is practically important: a castellain was not necessarily the castle's lord in the tenure sense; the role could be delegated.
Burrill also provides the richest source trail, citing Spelman's Glossarium, Bracton (fol. 363, 69b), Coke's Second Institutes (2 Inst. 31), Termes de la Ley, and Blount's Law Dictionary. This sourcing is useful for researchers who need to trace the term into primary medieval sources.
What the historical dictionaries do not address: the precise legal obligations and privileges attached to the castellainship — castle guard duties, wardship rights, and the relationship between castle tenure and knight service — are better pursued in treatises on feudal tenure than in these definitional entries, which treat the term as a title rather than a legal status with detailed incident.
Jurisdictional Note
Castellain is an English legal term with roots in Norman and Angevin feudal administration. Analogous figures existed throughout medieval Europe under comparable terminology, but the legal incidents of the office varied by jurisdiction. Researchers working in Scottish, Irish, or continental records should not assume English sources control the meaning of cognate terms in those contexts.