Definition
Ad compotum reddendum is a Latin phrase meaning "to render an account." In medieval and early English law, it described the obligation of a bailiff, guardian, receiver, or other fiduciary agent to formally present an accounting of moneys, goods, or property received and disbursed on behalf of another. The phrase appears principally in the context of the writ of account (also called the writ de computo), which compelled such a person to appear before a court and submit to examination of their stewardship. Failure to render the account as required could result in imprisonment or other compulsion.
The phrase derives its legal significance from the Statute of Westminster II (1285), chapter 11, which expanded the availability of the action of account and gave it procedural teeth by allowing the court to commit a defaulting accountant to prison until the account was produced.
Common Confusion
Ad compotum reddendum is sometimes loosely conflated with the broader writ or action of account (de computo) itself. The distinction matters: ad compotum reddendum names the specific obligation — the duty to render — while the writ of account is the procedural mechanism by which a court enforced that duty. Researchers who find the phrase in a historical pleading or statute should read it as describing what the defendant was ordered to do, not as the name of the action.
Why It Matters in Research
This phrase is almost exclusively a term of medieval and early modern English practice. Researchers will encounter it primarily in three contexts: (1) historical pleading records from the English Court of Common Pleas or Exchequer; (2) statutory commentary on the Statute of Westminster II, which is the anchor citation for all three source dictionaries; and (3) secondary works on the history of fiduciary and agency law tracing the development of the accounting obligation from feudal stewardship into modern trust and agency doctrine.
The term effectively disappears from living legal vocabulary after the abolition of the old forms of action in England by the Common Law Procedure Acts (mid-nineteenth century) and their American equivalents. In American research, you are unlikely to find it in any source dated after roughly 1850 except as an antiquarian reference. If it appears in a post-abolition American source, the author is almost certainly quoting or paraphrasing an older English authority.
A navigational trap: the Statute of Westminster II is cited inconsistently across historical dictionaries and treatises — sometimes as "Stat. Westm. 2," sometimes as "St. Westm. 2," sometimes with the chapter number rendered as "c. 11" or "cap. 11." These all refer to the same provision. Researchers should not treat variant citation forms as references to different sources.
The phrase also connects the early action of account to later equitable accounting doctrine. Equity courts eventually absorbed much of what the writ of account had done at common law, and the language of "rendering an account" carried forward into chancery pleading and ultimately into modern fiduciary law — though the Latin formula itself did not survive the transition.
Historical Dictionary Support
All three source dictionaries — Black's (1st ed.), Black's (2nd ed.), and Burrill's — give identical or near-identical entries: the Latin phrase, its English translation ("to render an account"), and the citation to Statute of Westminster II, c. 11. There is no meaningful divergence among them, which itself is informative: none of the historical lexicographers treated the term as requiring elaboration. It was understood by its intended audience as a self-evident formula within the action of account, requiring only identification and a statutory peg.
What the historical dictionaries do not supply is any procedural or doctrinal context — they do not explain who was subject to the obligation, what the consequences of default were, or how the phrase fit into the broader structure of the writ. For that context, researchers should consult Blackstone's Commentaries (Book III, Chapter 7, on the action of account) and Fitzherbert's Natura Brevium, both of which treat the writ of account in the substantive detail that dictionary entries omit.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Action of Account; Statute of Westminster II; Writ Practice in Medieval English Law.