Definition
Codex Vetus (Latin: "old code") refers to the first edition of the Code of Justinian, the foundational compilation of Roman imperial law ordered by Emperor Justinian I and completed in 529 CE. This original version was superseded by a revised edition — the Codex Repetitae Praelectionis — issued in 534 CE, which incorporated new imperial constitutions promulgated in the intervening years. The Codex Vetus itself has not survived; no manuscript copies are known to exist, and its precise contents are reconstructable only through inference from the later edition and from references in other sources of the Justinianic corpus.
Why It Matters in Research
Researchers encountering the term Codex Vetus in historical legal sources should understand immediately that the document being referenced is irretrievably lost — this is not a source that can be consulted directly, and citations to it in secondary literature are necessarily indirect. When historical treatises and commentaries distinguish between the "old code" and the revised code, they are flagging that certain imperial constitutions may have appeared in one edition but not the other, or that textual variants may be attributable to revision between 529 and 534 CE. For researchers working with Roman law materials, civil law histories, or the reception of Justinianic law in medieval and early modern European legal systems, the distinction matters primarily as a reminder that even the surviving Codex (the 534 version) represents a second-generation document, not Justinian's first attempt at codification. Because primary engagement with the Codex Vetus is impossible, Law Mind corpus researchers will find references to it almost exclusively in treatises on Roman law history and civil law foundations — most notably in works like Mackeldey's Compendium of Modern Civil Law, which both Black's and Burrill's cite as the authority for this entry.
Historical Dictionary Support
Black's Law Dictionary and Burrill's Law Dictionary are in complete agreement on this term: both define Codex Vetus simply as the first edition of the Code of Justinian, note that it is now lost, and cite Mackeldey's Roman (Civil) Law as the supporting authority. The near-identical entries suggest that one drew directly from the other, or that both relied on Mackeldey as the shared primary source — a common pattern in nineteenth-century American legal dictionary compilation.
Neither dictionary elaborates on why the Codex Vetus was superseded, the nature of the revisions Justinian made, or the relationship of the Codex Vetus to the broader Corpus Juris Civilis. This is appropriate for a dictionary entry but leaves researchers without context for understanding the term's significance in civil law scholarship. The historical dictionaries also do not flag the implication that follows from the document's loss: all modern scholarship on the "Code of Justinian" treats the 534 Codex Repetitae Praelectionis as the operative text, making references to the "old code" in civil law commentary a marker of historical precision rather than a pointer to an accessible source.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Corpus Juris Civilis; Justinian's Codification; Roman Law in the Western Legal Tradition