Definition
In Roman and civil law, infantia refers to the earliest stage of legal childhood, spanning from birth through the completion of the seventh year of age. A child within this period was called an infans — literally, one who cannot speak — and was considered entirely without legal capacity. The infans could neither enter into legal obligations nor bear criminal responsibility. This was the most protected and most legally incapacitated stage in the Roman law of persons.
Infantia is distinct from the broader concept of infancy (infanta or minor aetas), which extended further into childhood and adolescence. Where older children might possess partial legal capacity — subject to the protection of a guardian (tutor) and capable of certain acts beneficial to themselves — the child in infantia had no legal will recognized by law whatsoever.
Common Confusion
INFANTIA vs. INFANCY: These terms are related but not interchangeable. Infancy in Anglo-American law is a broad status covering all persons under the age of majority (historically 21, now typically 18), and it carries graduated legal consequences depending on age and context. Infantia is a narrower civil-law term of art describing only the first seven years of life — a specific sub-period within infancy carrying the most absolute incapacity. Researchers encountering infantia in civil law texts should not read it as a synonym for minority or legal infancy in the common law sense.
INFANTIA vs. IMPUBERTY: Roman law divided childhood into further stages after infantia, including the period of impuberty (from age seven to puberty — roughly fourteen for males, twelve for females). A child past infantia but not yet of puberty had limited but recognized legal capacity, particularly for acts that improved rather than burdened their legal position. This graduated framework has no precise parallel in standard common law infancy doctrine.
Why It Matters in Research
Infantia is primarily a term of Roman and civil law provenance and appears in Anglo-American legal sources mainly through the civilian tradition — in treatises drawing on Justinian's Institutes, in ecclesiastical and admiralty courts, and in early common law commentators who borrowed Roman conceptual frameworks. Researchers encountering infantia in historical legal texts should situate the term within a civilian rather than a common law analytical framework.
The seven-year threshold carried practical consequences that echo into later law. The common law rule that a child under seven years is conclusively presumed incapable of criminal intent is generally traced to this civil law conception of infantia, transmitted through Blackstone and earlier commentators. Researchers tracing the origins of the common law infancy defense in criminal cases will find infantia a necessary conceptual anchor.
Be alert to the distinction between infantia as a fixed chronological stage and the more flexible Anglo-American judicial inquiry into a particular child's actual capacity. Civil law treated the age boundary as absolute; common law gradually shifted toward a more fact-sensitive inquiry for children between seven and fourteen, with only the under-seven category remaining as a hard rule.
Burrill cites Blackstone's Commentaries (4 Bl. Com. 22) for the age boundary, confirming the term's passage into English legal commentary. Calv. Lex. (Calvinus, Lexicon Juridicum) is cited across all four source dictionaries as the standard reference — a reminder that much of the definitional infrastructure for Roman law terms in these dictionaries derives from post-glossator continental sources, not from primary Roman texts directly.
Historical Dictionary Support
All four source dictionaries are in close agreement: infantia denotes the civil law period from birth to completion of seven years. The definitions are brief and consistent, suggesting the term was well-settled and uncontested in the legal lexicon by the time these dictionaries were compiled.
Burrill provides the most substantive treatment, adding Heineccius (Elementa Juris Civilis) alongside Calvinus and Blackstone, and framing the definition in terms of "completion" of the seventh year — a precision worth noting, since the period ends not on the seventh birthday as a matter of birthday counting but upon the full completion of seven years of life.
Rapalje & Lawrence is the only source that immediately follows infantia with a discussion of infanticide, a juxtaposition that reflects the practical legal concern in the mid-nineteenth century about determining the legal status of newborns — whether born alive, killed in utero, or found dead. While infanticide is a separate entry, the proximity in Rapalje signals that questions of infantia-age children and their deaths often arose together in judicial investigations.
None of the historical dictionaries elaborate on the internal Roman law distinctions within the pre-seven period (such as the infans proximus infantiae and infans proximus pubertati that some Roman jurists recognized), nor do they trace the theological and canonical dimensions of the age-seven threshold. Researchers needing those threads will need to go beyond these dictionaries to primary civilian sources.
Jurisdictional Note
Infantia as a term appears in jurisdictions with civilian legal traditions — Louisiana, Quebec, and civil law systems in Europe and Latin America — where Roman law periodization may retain analytical relevance. In common law jurisdictions, the term itself has largely fallen out of use, but its substantive content survives in the criminal law presumption that children under seven lack criminal capacity.