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Louis de Courcillon, known as the abbé de Dangeau (January 1643, in Paris – 1 January 1723, in Paris) was a French churchman and grammarian, best known for being the first to describe the nasal vowels in the French language. Originally a Protestant of Huguenot origin, he converted to Catholicism in 1668 after a trip to Poland.[1] He was a younger brother of Philippe de Courcillon de Dangeau.