Louis-Nicolas Bescherelle

Louis-Nicolas Bescherelle (French: [bɛʃ(ə)ʀɛl]; 10 June 1802, Paris – 4 February 1883, Paris) was a French lexicographer and grammarian.
With help from his brother Henri (1804 – 1887), he wrote "Le Véritable Manuel des conjugaisons ou la science des conjugaisons mise à la portée de tout le monde", a reference guide to French verb conjugation, in 1842. The book became so important that his last name is used as a noun to refer to any French conjugation book ("a Bescherelle").