Definition
Combustio pecunie (Latin: "burning of money") is a historical legal procedure used in medieval England to test the purity of coin tendered to the royal exchequer. Because coins of the period were often debased — mixed with copper, brass, or other base metals — payment in the correct number and weight of coins did not guarantee that the Crown received full monetary value. Under combustio pecunie, a sample of coins was melted down and the residue assayed to determine whether the metal content met the required standard of silver. If the coins failed the burn test, the payer was required to make good the deficiency.
The procedure was formalized during the reign of Henry II, when the Bishop of Salisbury, serving as treasurer, recognized that coins satisfying the requirements of number (numero) and weight (pondere) could still be deficient in intrinsic value if alloyed with base metals. A constitution was issued establishing the burn test as the official method of verification for exchequer receipts.
Why It Matters in Research
Combustio pecunie is a narrow historical term encountered almost exclusively in sources dealing with medieval English fiscal administration, exchequer procedure, and monetary law. Researchers are unlikely to encounter it outside those contexts, but it serves as a useful index term when tracing the legal history of coinage standards, the exchequer's supervisory authority over currency, and the Crown's financial prerogatives.
The term connects to a broader cluster of medieval monetary concepts — including the assay of coin, the mint indenture system, and later statutory currency reforms — that are relevant to research on the history of public finance and the royal prerogative over money. Researchers working on Dialogus de Scaccario (Dialogue of the Exchequer), the principal contemporary source on twelfth-century exchequer procedure, will find combustio pecunie discussed in that context, though the Dialogus uses its own terminology. Bouvier's entry, while brief, cites Black's Law Dictionary as an additional source, suggesting the term was recognized across standard nineteenth-century American legal reference works despite its exclusively English medieval application.
Because the procedure predates any common law judicial framework in the modern sense, it should not be read as a "legal remedy" in the contemporary meaning. It was an administrative verification mechanism — an instrument of fiscal accountability rather than of private legal rights. Researchers should be cautious not to analogize it too readily to modern assay or currency fraud doctrines.
Historical Dictionary Support
Bouvier's entry is sparse, capturing the essential meaning — melting down suspect coin to test its composition — and attributing the formal institution of the practice to the reign of Henry II through action of the Bishop of Salisbury as treasurer. The entry notes the constitutive logic clearly: coins could satisfy the formal requirements of number and weight while still failing in value, and the burn test was the mechanism that closed this gap.
Bouvier cross-references Black's Law Dictionary, indicating the term was carried into American legal reference literature, almost certainly as a matter of historical completeness rather than because the procedure had any direct American application. No American jurisdiction ever administered an exchequer on the English medieval model, and combustio pecunie has no functional descendant in American law.
What the historical dictionaries do not provide is any discussion of how the procedure fit within the broader structure of exchequer accountability, how frequently it was invoked, or what consequences followed a failed test beyond the requirement to make good the deficiency. For that level of institutional detail, primary sources — particularly the Dialogus de Scaccario — and modern scholarship on Angevin fiscal administration are necessary.
Jurisdictional Note
Combustio pecunie is an English legal-historical term with no counterpart in American, Scottish, or continental legal systems. Its relevance is confined to medieval English exchequer law and the history of monetary administration under the Angevin kings.