IIF Certified Assessment
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IIF Certified Assessment
People who died long before intelligence testing existed, and the retrospective estimates made about them.
Each entry opens onto the full story behind the figure.
Portrait by Godfrey Kneller (1689), public domain. · Presumed self-portrait, red chalk, c. 1512, via Wikimedia Commons, public domain. · Photograph by Henri Manuel (c. 1920), public domain. Background removed for the portrait above. · Photograph (1913) held by Trinity College, Cambridge, via Wikimedia Commons, CC BY 4.0. · Photograph by Louis Bachrach, Bachrach Studios, restored by Michel Vuijlsteke, public domain. Background removed for the portrait above. · Daguerreotype by Antoine Claudet (c. 1843), public domain. · Portrait by Christian Albrecht Jensen (1840), via Wikimedia Commons, public domain. · Portrait by Joseph-Siffred Duplessis (c. 1785), public domain. · Photograph by Maull & Fox (1854), public domain. Background removed for the portrait above. · Portrait, copy after François II Quesnel, via Wikimedia Commons, public domain.
More profiles are on the way. A name joins this category once its figure has been traced and a properly licensed portrait is cleared.
Get a measured score first — then the comparison actually means something. Thirty questions, instant result.
Start the test →Not by testing anyone. Each figure on this page is inferred from the documented record — published work, contemporary accounts, verified qualifications — using a named method set out under how we read a number. Every profile shows its own workings.
Blaise Pascal holds the highest estimate in this category at 180–195. That ordering comes from the midpoint of each range and it re-sorts itself as profiles are added, so treat it as a convenience rather than a verdict. The full leaderboard ranks every category together.
10 so far, and the list grows as figures are traced and portraits licensed. Browse the rest of the section from all categories, or start at the Celebrity IQ hub.
Get a measured number first. The IQ Metrics assessment is 30 questions and reports on the same 100-mean scale used on every profile here, with a percentile and an ability breakdown. How we score and norm it explains the benchmarking, and average IQ by country shows how the same scale looks across populations.
Your score, your percentile, your ability breakdown and a printable IIF certificate.
Find your IQ score now! →The assessment costs nothing and you always get a real result. Upgrades add precision, analysis and a certificate — never access to the test itself.
Whatever you paid comes off the next tier for 30 days. Start small without losing the money.
Not what you expected? Full refund, no questions, no form to hunt for.
Prices adjust to your country automatically, so the certificate is reachable outside high-income markets.
Coming later: an annual membership (~$89/year) for unlimited retests, practice sets and progress tracking. Monthly billing is deliberately not offered — a once-a-year assessment does not justify a monthly charge, and it would churn.
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