Definition
Latin: "good memory." A phrase appearing in traditional legal formulas to describe one component of testamentary capacity — specifically, the ability of a testator to recall and understand the nature of their property, their relationships, and the act of making a will. The full phrase most commonly encountered in historical documents is *sana mentis et bonae memoriae* (or *sana mentis et bona memoria*): "of sound mind and good memory." Together, the two elements signal that the testator possessed the mental fitness required for a valid will.
Bona memoria is not a standalone legal standard. It functions as part of an attestation clause or recital — language inserted into a will or affidavit to confirm that the testator, at the moment of execution, was mentally competent. Modern law has largely replaced this formulaic Latin with plain-English capacity inquiries, but the phrase remains a fixture of historical wills and probate records.
Common Confusion
Bona memoria is sometimes read as a general statement of good character or reputation — it is not. Memory here means cognitive recall specifically, not moral standing or social esteem. The phrase also does not equate to full testamentary capacity on its own; courts have consistently held that capacity requires more than intact memory, including understanding of the nature of a will and recognition of one's natural heirs. Bona memoria addresses one dimension of that larger inquiry.
Researchers should also distinguish bona memoria from bona fide, a more familiar Latin phrase meaning "in good faith." The two share the word *bona* but operate in entirely different legal contexts.
Why It Matters in Research
The primary research value of bona memoria is documentary: it is a signal phrase that identifies attestation clauses in historical wills, probate petitions, and court records. When scanning colonial, antebellum, or nineteenth-century estate documents, encountering *sana mentis et bona memoria* — or any variant — marks the moment the drafter addressed testamentary capacity. That is often where contested probate litigation focused.
Several navigational notes for corpus researchers:
First, spelling and Latin form vary widely across historical sources. You will encounter *bonae memoriae*, *bona memoriæ*, and anglicized constructions like "of good memory." Searching any single variant will miss records using the others.
Second, the phrase appears in both the operative text of older wills and in court opinions reviewing will contests. In the opinion context, bona memoria may be quoted from the instrument itself or invoked as a shorthand for the memory prong of the capacity test. These are different uses — one is drafting convention, the other is legal analysis.
Third, as testamentary capacity doctrine developed through the nineteenth century, courts began unpacking what "good memory" actually required. The phrase shifted from formulaic recital to contested legal element. Research into will contests from roughly 1820 onward will find courts scrutinizing whether the testator truly possessed bona memoria, not merely whether the clause appeared in the document.
Fourth, the phrase essentially disappears from modern drafting. Contemporary wills use plain-English capacity recitals. If you are researching modern testamentary capacity standards, bona memoria is a historical antecedent, not an operative term.
Historical Dictionary Support
Black's Law Dictionary defines bona memoria as "good memory," noting its use in the phrase *sana mentis et bona memoria* to describe the mental capacity of a testator. Rapalje & Lawrence confirm the same definition and the same primary context — testamentary capacity — attributing the usage note to Abbott's Law Dictionary. Both sources are in agreement: the term is narrow, formulaic, and tied almost exclusively to the will-execution context.
What the historical dictionaries do not address is how courts actually applied the phrase when testamentary capacity was disputed. Neither source distinguishes between the phrase as a drafting recital and the phrase as a substantive legal standard. For the doctrinal evolution of testamentary capacity — what memory must a testator actually possess, and how is its absence proven — researchers will need to look beyond dictionary definitions to treatises on wills and probate and to the case law itself.
Jurisdictional Note
Testamentary capacity standards are governed by state law, and the specific elements courts require vary by jurisdiction. While bona memoria appears in the historical record across American and English jurisdictions, its precise weight within a capacity analysis — and whether intact memory alone was sufficient or merely necessary — was worked out differently in different states. Colonial and early American jurisdictions often followed English ecclesiastical court practice closely; later divergence tracked local statutory and common law development.