Definition
A Latin maxim of the law of evidence, rendered in full as *Plus valet unus oculatus testis quam auriti decem*: "One eye-witness is of more weight than ten ear-witnesses." The principle holds that direct, firsthand observation carries greater evidentiary weight than testimony derived from hearsay — what others have said or reported. A companion formulation, *Plus vident oculi quam oculus* ("Several eyes see more than one"), extends the logic in a different direction, affirming that multiple direct observers collectively perceive more than any single witness.
Together, the two maxims address the quality and quantity dimensions of eyewitness testimony: the first establishes the hierarchy of direct over hearsay evidence; the second cautions that no single observer, however reliable, captures the whole of an event.
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Common Language
The Latin phrase translates literally as "one who has seen with the eye is worth more than ten who have heard." The individual words present no special difficulty — *oculatus* (having eyes, having seen) versus *auriti* (ear-witnesses, those who have heard) — but the legal significance of the distinction is not merely linguistic. In common experience, being told something by many people may feel more convincing than hearing it from one. The maxim inverts that intuition for legal purposes, privileging direct sensory observation over the accumulation of reports, no matter how numerous.
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Common Confusion
The two related maxims are sometimes conflated. *Plus valet unus oculatus* concerns the qualitative hierarchy of direct over hearsay testimony. *Plus vident oculi quam oculus* concerns the quantitative benefit of multiple direct observers over one. They are complementary, not synonymous. A researcher encountering either phrase in historical sources should confirm which maxim is being invoked before drawing conclusions about how the passage treats witness credibility.
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Why It Matters in Research
This maxim appears most frequently in older English and American legal texts as a rhetorical anchor for arguments about hearsay and witness credibility. Coke's *Institutes* — the source cited in Black's — gives it currency well into the common law tradition, meaning researchers will encounter it in seventeenth- and eighteenth-century English cases and treatises, as well as in early American decisions that drew heavily on Coke.
Two traps are worth flagging for corpus researchers. First, the maxim predates the modern hearsay rule as a formal exclusionary doctrine. When historical sources invoke *plus valet unus oculatus*, they are generally making a credibility argument, not an admissibility argument. Reading the phrase as an early statement of the hearsay exclusion projects modern doctrine backward. Second, *plus vident oculi quam oculus* — the companion phrase — appears on a different page of the *Institutes* (4 Inst. 160 versus 4 Inst. 279) and carries a distinct meaning. Sources that cite one do not necessarily endorse or invoke the other.
For researchers tracing the development of hearsay doctrine, the maxim is a useful historical data point showing how courts and treatise writers grounded witness-preference rules in proverbial Latin authority before statutory and common-law hearsay rules became systematized. Its frequency in a given source can help date the argumentative style and identify the intellectual tradition the author is working within.
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Historical Dictionary Support
Black's Law Dictionary (2nd Ed.) records both maxims together under this heading, presenting them as paired principles. The entry is concise and descriptive, offering translation and citation to Coke without extended commentary. This pairing is editorially useful but can obscure the fact that Coke deployed them in separate contexts and on separate pages of the *Institutes*.
Historical legal dictionaries generally treat these maxims as settled common-law aphorisms rather than contested doctrinal propositions, which reflects their function in the literature: they were invoked as authoritative-sounding support rather than argued about on their merits. No significant divergence exists among historical sources on the core meaning, though some sources quote only the first maxim and are silent on the second.
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