[France] Birthplace of the Enlightenment philosopher "Diderot", author of an encyclopedia, Langres 

Langres is a beautiful fortress located on a rocky hill 475m above sea level in the Grand Est region of France, about 300 km from Paris.
Dating from the Gallo-Roman era, it was built and permanently maintained to protect its geographical location: it is a well-preserved medieval fortress with 12 towers and 7 gates, 3.6 km long.
As a philosopher of the Enlightenment, "Deni Diderot" (1713-1784), who compiled an encyclopedia born in Langres.
He befriends Jean-Jacques Rousseau and befriends Montesquieu, François Quesnay and Georges-Louis Leclerc, Count of Buffon.
His greatest achievement is the compilation of an "Encyclopedia", a collection of 18th century scholars, ideology and technology involving more than 180 writers.
However, Louis XV designated the encyclopedia as a prohibited book.
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