Denis Diderot, French philosopher and critic (died 1784)

Denis Diderot was a French philosopher, art critic, and writer, best known for serving as co-founder, chief editor, and contributor to the Encyclopédie along with Jean le Rond d'Alembert. He was a prominent figure during the Age of Enlightenment.

October 5 is the 278th day of the year in the Gregorian calendar; 87 days remain until the end of the year.