Definition
A Latin verb from Roman civil law meaning "to promise." In the law of obligations, *promittere* denoted the act of undertaking a binding commitment, typically through a formal verbal exchange. The canonical form was the question and answer: *Promittis?* ("Do you promise?") followed by the response *Promitto* ("I do promise"). This exchange constituted one recognized mode of creating an enforceable obligation under Roman law.
Why It Matters in Research
Researchers encounter *promittere* primarily in texts dealing with Roman contract law — particularly the law of stipulatio, the formal verbal contract by which obligations were created through spoken question and answer. The term appears in Justinian's Institutes and in civilian commentaries that draw on that tradition.
The key navigational point: *promittere* is not the dominant term of art even within Roman law. Burrill's own entry flags that the more common word of formal engagement was *spondeo* ("I undertake"), not *promittere*. Researchers analyzing Roman stipulations or their influence on civilian contract doctrine should therefore treat *promittere* as a secondary or variant term and trace the primary scholarship through *stipulatio*, *spondeo*, and *sponsio*. Sources that discuss Roman obligational form will often use these terms interchangeably or in sequence; conflating them without understanding their relative weight in Roman practice will distort analysis.
For researchers working in Anglo-American common law sources, *promittere* has no operative technical role. It surfaces mainly in historical, comparative, or civilian-influenced treatises. When encountered in such sources, it signals discussion of the Roman law foundations of contract — a reminder that civilian concepts of obligation and consideration developed along different lines than the common law.
Historical Dictionary Support
Burrill's Law Dictionary provides a compact but instructive entry. It correctly identifies *promittere* as civil law vocabulary, supplies the formal verbal exchange (*Promittis? Promitto*), and cross-references Justinian's Institutes (Book III) for authority. Burrill's note that *spondeo* was the more common word of engagement is an important qualification — it prevents researchers from overstating *promittere*'s centrality in Roman obligational practice. The entry is brief by design: *promittere* is a building-block term, not a doctrine, and Burrill treats it accordingly. No significant divergence among historical sources is expected on this term; its meaning is stable and narrow.