Definition
De aleatoribus (Latin: "about gamesters" or "concerning gamblers") is the title of a heading in the Digest of Justinian (Digesta Justiniani), specifically at Book 11, Title 5. As a legal term, it does not name a doctrine, right, or remedy in its own right. It is instead a classificatory title from Roman civil law, designating the section of the Pandects governing rules applicable to gamblers and gaming transactions — including the enforceability of gambling debts, the liability of innkeepers who permitted illegal gaming on their premises, and related civil obligations arising from games of chance.
The term appears in common-law legal dictionaries primarily as a reference point for Roman law sources, not as an operative concept in English or American jurisprudence.
Common Language
Modern common usage (Wiktionary): No standard entry. "Aleatory" (the adjectival form) means depending on chance or contingency.
Historical common usage (Webster's 1913): "Aleatory" — depending on some uncertain contingency; used in law of contracts dependent on chance, as insurance or annuity contracts.
The shared root — Latin alea, meaning a die or game of chance — connects the Digest title to the familiar legal adjective "aleatory," used in modern contract law to describe agreements where performance is contingent on an uncertain event. A researcher encountering "aleatory contract" in modern sources is working in a related but distinct legal tradition from the Roman-law title de aleatoribus. The Roman title addressed the regulation of gamblers as a class; the modern aleatory contract concept addresses contractual structure and risk allocation.
Why It Matters in Research
De aleatoribus matters to researchers primarily as a gateway into Roman law sources on gaming and gambling regulation. If you encounter it in an English-language legal dictionary or treatise, it is almost always a citation anchor pointing to Dig. 11, 5 — not a substantive rule being applied directly.
Several research traps attend this term:
First, the term appears in historical dictionaries immediately adjacent to, and in some editions run together with, the entry for De allocatione facienda (a writ concerning exchequer allowances). Burrill's entry in particular bleeds the two entries together typographically, which can cause confusion when reading digitized or transcribed versions of that dictionary. A researcher scanning Burrill should not read the combined passage as a single definition.
Second, de aleatoribus is not a term of English common law. It will not appear in writs, pleadings, statutes, or case reports as an operative concept. Its presence in English legal dictionaries reflects the tradition of Roman law scholarship embedded in common-law legal education, not practical application.
Third, researchers tracing gambling law history should distinguish between: (a) Roman civil law on gaming debts under Dig. 11, 5; (b) early modern English statutes on gaming (such as the Gaming Act 1710 and its successors); and (c) modern regulatory gambling law. These are three separate research streams that share subject matter but draw on entirely different sources.
If you are working backward from a modern gambling contract question to Roman law foundations, de aleatoribus is the correct Digest citation anchor. If you are working forward from Roman law into natural law or civilian commentary, the Digest title connects to the broader commentary tradition on contracts involving chance — which eventually feeds into modern aleatory contract doctrine.
Historical Dictionary Support
All three source dictionaries agree on the core definition: de aleatoribus means "about gamesters" and names a title in the Pandects at Dig. 11, 5. There is no substantive divergence among them on this point.
Black's (1st and 2nd editions) give identical entries, confirming the term had a stable, narrow meaning in legal reference literature. Burrill adds no additional content on the term itself, though his entry is rendered confusingly in the surviving text due to typographic run-on with the following entry on De allocatione facienda.
None of the three dictionaries develop the substantive content of Dig. 11, 5 — what rules the Roman law actually imposed on gamesters — because they function as citation locators rather than substantive commentaries. A researcher wanting the content of that Digest title would need to consult a translation of the Pandects directly or a civilian treatise that unpacks it.
What the historical dictionaries do not address: the connection between this Roman title and the later development of "aleatory contract" as a term of art in Anglo-American contract law. That connection is terminological and conceptual but not direct doctrinal inheritance — a gap worth noting for any researcher attempting to trace a continuous line of authority.