It turns out that the standard picture of Adrien-Marie Legendre was actually a picture of his contemporary, the revolutionary Louis Legendre. (See the Notices article for the story. Gérard P. Michon has a photograph of the only known portrait of Adrien-Marie Legendre (a caricature).

Next up: mathematicians discover that the inventor of algebraic topology was not, after all, the President of France during World War I.