Definition
In old English and Roman law, a castle — a fortified structure serving both a defensive military function and, in the English context, an administrative one. The term carries two related but distinct applications:
1. Old English law: A castle in the general sense of a fortified place, and by extension, a castle together with its associated manor or dependent lands. The term thus encompassed both the physical stronghold and the landed estate organized around it.
2. Roman law: A camp or encampment — reflecting the term's Latin root and its original military application in the classical tradition.
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Common Confusion
Ocastrum and castrum are closely related and sometimes used interchangeably in historical sources, but ocastrum appears as a Latinized variant form found in English legal records rather than in classical Roman texts. Researchers should not assume that every use of a castle-related Latin term in a medieval document carries the same scope. In English law, ocastrum expressly extended to include the manor dependent on the castle, making it a broader concept than a simple reference to a fortified structure.
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Why It Matters in Research
This term will appear almost exclusively in medieval English legal records, Bracton's treatise, and early common law materials dealing with feudal tenure, wardship, and property. The key research point is the dual scope of the term in English law: a reference to an ocastrum in a grant, plea, or inquisition likely encompasses both the fortification and its attached manor, which has direct consequences for understanding the boundaries of any conveyance, right of wardship, or jurisdictional claim being described.
Researchers working in the Law Mind corpus should be alert to several traps:
First, the term is rare enough that it may not be indexed in finding aids that rely on standardized English vocabulary. Searching for castle-related property disputes in Bracton-era materials may require searching Latin variants including ocastrum, castrum, castellum, and their ablative and genitive forms.
Second, the Roman law meaning (camp or encampment) diverges entirely from the English law meaning. A source written in a Roman law or civil law context should not be read as if it carries the English property law implications. Context — whether the source is a common law record or a civilian treatise — controls which meaning applies.
Third, the extension to include a manor is not merely definitional decoration. In feudal property law, the difference between a grant of a castle alone versus a castle-cum-manor could determine who held what rights over tenants, what passed on wardship, and what the grantor retained. Coke's treatment at 4 Coke 88 — though the Black's entry is truncated — signals that English lawyers applied this term in property disputes with real consequences.
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Historical Dictionary Support
Black's Law Dictionary (2nd Ed.) is the sole historical dictionary source available for this entry, and its entry is brief. It draws directly on Bracton (fol. 69) for the basic definition and on Coke (4 Coke 88) for the extension to include a manor. The truncated Roman law portion of the entry suggests that the Black's editors recognized the civil law dimension of the term but treated it as secondary to the English law application, which is appropriate for a common law dictionary.
No other historical legal dictionaries in the Law Mind shelf appear to carry this term, which reflects its highly specialized and archaic character. Researchers should treat this as a term of art belonging to the feudal and early common law period, unlikely to appear in sources after the medieval era except in antiquarian legal writing or historical commentary on Bracton-era materials.
The gap between the Roman law sense (camp) and the English law sense (castle plus manor) is itself a function of how Latin military terminology was absorbed and adapted by English medieval lawyers — a pattern common across feudal legal Latin.
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Jurisdictional Note
This term is confined to English common law in its property law application. It has no operative meaning in modern English or American law and would appear only in historical or archival research contexts. The Roman law sense belongs to civil law scholarship.
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