Definition
Unde legitimi (from Latin, "whence the legitimate [heirs]") is a term from Roman civil law designating one of the specific categories of bonorum possessio — the praetorian grant of possession of a deceased's estate. Unde legitimi was the grant made in favor of agnates, meaning those related to the deceased through the male line, who qualified as lawful heirs under the civil law (ius civile). Where closer heirs had failed to claim the estate or were absent, the praetor could award possession to these legitimate heirs under this heading.
In the classical Roman scheme of bonorum possessio, the praetor recognized several ordered classes of claimants. Unde legitimi was the second or third class in most accounts, called upon when the first class (typically sui heredes and emancipated children under unde liberi) had not taken. The term functions as a label for both the class of claimants and the specific grant of possession directed to them.
Why It Matters in Research
Unde legitimi appears almost exclusively in research contexts touching Roman law sources — the Institutes of Justinian (Book 3), the Digest (Title 38.7), and secondary treatments such as Heineccius and Hallifax. Researchers working in comparative legal history, civil law jurisdictions tracing their inheritance rules to Roman models, or ecclesiastical law (which preserved Roman inheritance principles well into the early modern period) may encounter this term in Latin source texts and their translations.
The term is a navigational marker within the broader bonorum possessio system. A researcher who encounters unde legitimi without first understanding that system will struggle to interpret the surrounding text correctly. The full sequence — unde liberi, unde legitimi, unde cognati, and related categories — forms a ranked scheme, and the significance of unde legitimi depends entirely on its position within that sequence. Jumping to this term without working through bonorum possessio generally is a common research error.
Institutional texts citing Inst. 3.10.1–2 and Dig. 38.7 are the primary sources. Heineccius's Elementa Iuris Civilis and Hallifax's Analysis of the Civil Law (Book 2, Chapter 11) are the main secondary treatments cited by Burrill and remain useful entry points into the doctrinal structure.
Historical Dictionary Support
Burrill's Law Dictionary provides the only dedicated entry in the Law Mind historical dictionary corpus. Burrill correctly identifies unde legitimi as a species of bonorum possessio and correctly attributes it to the agnates as lawful heirs, with accurate citations to the Institutes and Digest. The entry is brief but accurate as far as it goes.
What Burrill does not supply is doctrinal context: the ranked structure of praetorian classes, the distinction between bonorum possessio cum re (with real effect against civil law heirs) and sine re (without such effect), or the way the praetorian scheme gradually eroded the strict agnatic preference of the Twelve Tables. For full treatment, a researcher must go to the primary sources Burrill cites — Justinian's Institutes and the Digest — or to Heineccius, whom Burrill references. No other historical dictionary in the Law Mind corpus covers this term, which reflects its status as specialist Roman law vocabulary unlikely to appear in common law dictionaries.
Jurisdictional Note
Unde legitimi has no direct application in modern common law jurisdictions. In civil law systems derived from Roman law — including French, Spanish, and Louisiana law — the underlying structural concept of ordered inheritance classes survived, though the specific Roman terminology was generally replaced by domestic statutory language. Researchers working in Louisiana succession law or in comparative civil law contexts may find that Roman categories like unde legitimi illuminate the historical rationale of surviving rules, even where the term itself no longer appears in positive law.