Definition
Chirographa (singular: chirograph) refers, in Roman law, to written instruments or documents emanating from a single party — specifically the debtor — as opposed to bilateral instruments executed by both parties to an agreement. The chirograph was essentially a unilateral written acknowledgment of a debt or obligation, signed or produced by the obligor alone, without requiring the creditor's signature or seal. In broader medieval usage, the term also described a particular method of duplicating documents: a single parchment was written out twice (or sometimes three times), the copies separated by cutting through an interlined word — often "chirographum" — so that the matching cut edges could later be compared to verify authenticity.
Common Confusion
CHIROGRAPHA vs. SYNGRAPHA: In Roman law, these terms were directly opposed. A syngraph (syngrapha) was a bilateral instrument — executed by both debtor and creditor — while a chirograph was unilateral, executed by the debtor alone. The distinction affected evidentiary weight and the nature of the obligation evidenced. Sources discussing Roman obligatory instruments frequently use both terms; researchers should not treat them as interchangeable.
CHIROGRAPHA vs. CHIROGRAPH (English usage): The plural Latin term chirographa appears in Roman law discussions; the singular "chirograph" appears most frequently in English legal history in the entirely different context of indented, authenticated deeds and final concords. The shared root masks what are, for research purposes, distinct concepts requiring separate treatment.
Why It Matters in Research
Chirographa presents the classic challenge of a term that carries distinct meanings depending on the legal system and period under examination. Researchers working in Roman law materials will encounter chirographa as strictly unilateral debtor writings, distinguished from syngrapha — instruments signed by both parties. Researchers working in medieval English legal records will encounter "chirograph" in the entirely different sense of an indented or divided document used to authenticate deeds, final concords (the "foot of fine"), and similar instruments. These two meanings coexist in historical sources and are easy to conflate.
Because Black's Law Dictionary (both the first and second editions) limits the definition to the Roman law meaning without addressing the medieval English usage, researchers relying solely on Black's will miss the chirograph's central role in English conveyancing and the court of common pleas. The Feet of Fines — formal records of land transactions authenticated by chirograph — are a major category of medieval English legal records. If your research touches English property or conveyancing history before the nineteenth century, the medieval meaning is almost certainly more relevant than the Roman law definition.
Jurisdictional and temporal precision matters here. In Roman law sources, chirographa sit within the law of obligations and contrast with syngrapha as evidence of different levels of obligatory formality. In English legal history, the chirograph functions as an authentication mechanism, not a classification of unilateral versus bilateral instruments. Treat these as functionally separate terms that happen to share a name.
Historical Dictionary Support
Black's Law Dictionary and its second edition are in agreement on the Roman law definition: chirographa are writings emanating from a single party, the debtor. Both entries are brief to the point of incompleteness. Neither edition develops the term beyond this single sentence, and neither addresses the medieval English chirograph at all — a notable gap given the term's importance to English legal history and record-keeping practice.
Historical legal dictionaries in the common law tradition generally do somewhat better. Tomlin's Law Dictionary and Jacob's Law Dictionary (earlier English compilations) address the chirograph in its English conveyancing context, describing the indented document authenticated by the matching cut. Cowell's Interpreter similarly treats the chirograph as a method of authenticating deeds. These sources are more useful to researchers in English legal history than Black's on this particular term.
The Roman law meaning, while authentic, represents only one thread of this term's legal life. Any researcher who encounters "chirograph" or "chirographa" in an English legal source and reaches for Black's alone risks misreading the document entirely.