The station opened on 31 October 1912 as part of a northward extension of the
Nord-Sud company's Line A from
Pigalle to
Jules Joffrin. In 1930, the Compagnie du chemin de fer métropolitain de Paris bought out the Nord-Sud company and renamed Line A to Line 12 in order to conform to the former's convention. Originally named Constantin Pecqueur, after the short street at the top of the entrance stairway, which in turn derives its title from the socialist economist of the same name, Lamarck–Caulaincourt opened as Lamarck, a reference to Rue Lamarck, the road at the bottom of the entrance stairwell. At a later time, the station's name changed to Lamarck (Caulaincourt), and finally received the spelling of Lamarck–Caulaincourt. Rue Lamarck is dedicated to
Jean-Baptiste Pierre de Monet, Chevalier de Lamarck (1744–1829), a French naturalist who is mainly remembered for his theory of the
inheritance of acquired traits. Rue Caulaincourt is named after the marquis
Armand Augustin Louis de Caulaincourt (1773–1827), general, ambassador, and foreign minister from 1813 to 1814. == Station layout ==