Étienne Bonnot de Condillac, French epistemologist and philosopher (d. 1780)
Étienne Bonnot de Condillac (; French: [etjɛn bɔno də kɔ̃dijak]; 30 September 1714 – 2 August or 3 August 1780) was a French philosopher and epistemologist, who studied in such areas as psychology and the philosophy of the mind.