César Chesneau Dumarsais
Encyclopedia
César Chesneau, sieur Dumarsais or Du Marsais (July 17, 1676 – June 11, 1756) was a French
France
The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

 philosophe
Philosophe
The philosophes were the intellectuals of the 18th century Enlightenment. Few were primarily philosophers; rather they were public intellectuals who applied reason to the study of many areas of learning, including philosophy, history, science, politics, economics and social issues...

and grammarian. He was a prominent figure in what became known as the Enlightenment
Age of Enlightenment
The Age of Enlightenment was an elite cultural movement of intellectuals in 18th century Europe that sought to mobilize the power of reason in order to reform society and advance knowledge. It promoted intellectual interchange and opposed intolerance and abuses in church and state...

, and contributed to Diderot’s Encyclopédie
Encyclopédie
Encyclopédie, ou dictionnaire raisonné des sciences, des arts et des métiers was a general encyclopedia published in France between 1751 and 1772, with later supplements, revised editions, and translations. It was edited by Denis Diderot and Jean le Rond d'Alembert...

.

Born in Marseille
Marseille
Marseille , known in antiquity as Massalia , is the second largest city in France, after Paris, with a population of 852,395 within its administrative limits on a land area of . The urban area of Marseille extends beyond the city limits with a population of over 1,420,000 on an area of...

, Dumarsais trained in Paris as a lawyer, before abandoning the bar to pursue the life of the mind, subsisting on occasional law students and later on the meager revenue from a pension in the city's Faubourg-Saint Victor. He wrote clandestine tracts in favour of freethought
Freethought
Freethought is a philosophical viewpoint that holds that opinions should be formed on the basis of science, logic, and reason, and should not be influenced by authority, tradition, or other dogmas...

, attacked the French church in books and pamphlets, and proposed, to no avail, a reform of French orthography
Orthography
The orthography of a language specifies a standardized way of using a specific writing system to write the language. Where more than one writing system is used for a language, for example Kurdish, Uyghur, Serbian or Inuktitut, there can be more than one orthography...

. He died infirm; in the words of a eulogy penned for the Encyclopédie by D'Alembert
Jean le Rond d'Alembert
Jean-Baptiste le Rond d'Alembert was a French mathematician, mechanician, physicist, philosopher, and music theorist. He was also co-editor with Denis Diderot of the Encyclopédie...

, "he lived poor and ignored by the fatherland he had taught".

Principal works include Méthode raisonné pour apprendre la langue latine (1722) and Principes de grammaire (1769). Traité des Tropes (1730) was an influential early attempt to generate a philosophical theory of figurative language. A seven-volume French edition of his complete known works was published in 1797.
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