Definition
Bes (also bessis) is a Roman law term designating two-thirds of a unit. It most commonly appears in three legal contexts:
1. Fractional unit of the as. The as was the foundational Roman unit of measurement and monetary accounting, divided into twelve unciae (twelfths). The bes comprised eight of those twelve parts — two-thirds of the whole.
2. Fractional share of an inheritance. In Roman succession law, bes denoted a two-thirds portion of an estate, used when dividing an inheritance among heirs according to the duodecimal system that governed Roman testamentary apportionment.
3. Rate of interest. Bes also expressed a rate of eight percent interest — derived from the same fractional logic: eight parts per twelve, applied to financial calculations under Roman law.
The term has no operative role in modern common law systems and appears in legal sources exclusively in the context of Roman law exposition or historical commentary.
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Common Language
Modern common usage (Wiktionary): "Bes" as an English word is the third-person singular simple present of "be" — a grammatical inflection, not a noun.
Historical common usage (Webster's 1913): Not independently defined as a legal or common term in the Webster's tradition; the Roman law meaning was treated as specialized vocabulary.
The gap here is absolute rather than subtle: the everyday English form "bes" (as in "he bes") and the Roman law term bes share no meaning whatsoever. A researcher encountering "bes" in a historical legal text should treat it as a Latin term of art, not an English word.
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Why It Matters in Research
Bes is a navigational hazard rather than an actively litigated concept. Researchers are most likely to encounter it in three situations:
First, in historical English legal treatises that incorporate Roman law commentary. Blackstone's Commentaries (2 Bl. Comm. 462, note m) uses bes in explaining Roman fractional inheritance divisions — a passage cited directly in both Black's editions. Encountering the term in a footnote or annotation to Blackstone without knowing its meaning can cause misreading of the surrounding inheritance or property discussion.
Second, in comparative law or civil law scholarship. Continental legal systems derived from Roman law used the duodecimal fractional system extensively. Bes and its companion terms (triens, quadrans, sextans, uncia) form a vocabulary cluster that recurs in discussions of testamentary law, usufruct, and property division. Knowing that bes = 8/12 = two-thirds anchors the entire system.
Third, in sources discussing Roman interest rates. The connection between bes and eight percent interest is less intuitive and more likely to be misread. A legal historian analyzing Roman credit instruments who does not recognize bes as an interest-rate expression may misinterpret a financial clause entirely.
The term does not appear in modern statutory or case law. Its research value is purely historical and comparative.
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Historical Dictionary Support
Both Black's editions agree on the core definition: bes equals eight unciae, two-thirds of the as, and two-thirds of an inheritance. The second edition adds the interest-rate meaning explicitly (eight percent), which the first edition omits or leaves implicit. This is a meaningful divergence — researchers relying solely on the first edition may miss the financial application entirely.
Both editions source the definition to Blackstone's Commentaries (2 Bl. Comm. 462, note m) and the Institutes of Justinian (Inst. 2, 14, 5 — the inheritance context). These citations are traceable and reliable anchors for further research.
Neither edition situates bes within the full duodecimal fractional vocabulary of Roman law, which limits their usefulness for researchers who need to interpret bes alongside triens (one-third), semis (one-half), or uncia (one-twelfth). The Latin lexicographic tradition — particularly Lewis and Short — provides the fuller picture that Black's does not.
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