The forgotten aristocrat who wrote nearly half of the Enlightenment's greatest encyclopedia

Ideas & Philosophy · Published 3 October 2026 Swipe more like this →

In short: Louis de Jaucourt was the most prolific contributor to the Encyclopédie, authoring over 17,000 articles pro bono. Despite his massive output, he was long overshadowed by his peers. A wealthy aristocrat, he employed secretaries to help him document the sum of human knowledge while masterfully bypassing French censors.

Born in Paris in 1704, Louis de Jaucourt was an unlikely hero of the Enlightenment. As a member of a Huguenot family, he faced suspicion from the Catholic establishment, prompting him to pursue a life of scholarship across Geneva, Cambridge, and Leiden. His early career was marked by tragedy; after spending two decades writing a six-volume medical lexicon, the only manuscript was lost when the ship transporting it to Amsterdam sank. Undeterred, he turned his energy toward the Encyclopédie, where he eventually contributed approximately 25% of the total work.

Jaucourt’s dedication was so intense that he earned the nickname l'esclave de l'Encyclopédie, or the slave of the Encyclopedia. Between 1759 and 1765, he produced an average of eight articles daily, totaling 17,266 entries and roughly 4.7 million words. Unlike other contributors, he was independently wealthy and refused payment, even paying for his own team of secretaries to take his dictation. While some critics derided his method of summarizing and copying existing texts, he used this technique to curate specific, often radical, Enlightenment ideas.

His political influence was subtle but profound. To avoid the censors, Jaucourt often misattributed controversial quotes or used historical parallels to critique modern French society. He was a staunch advocate for natural rights, using his platform to condemn slavery and the commodification of human life. By choosing specific authors and emphasizing particular passages, he embedded his own anti-clerical and reformist beliefs into the heart of the project. Though his aristocratic background led to his legacy being eclipsed after the French Revolution, modern scholarship now recognizes his vital role in shaping the intellectual landscape of the 18th century.

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