There are two birth certificates for Chamfort. The first, from Saint-Genès parish in Clermont-Ferrand, the capital city of Auvergne, says he was born there on 6 April 1741, the son of a grocer with the surname of Nicolas, and that he was given the name "Sébastien-Roch", so that his full name was Sébastien-Roch Nicolas. But a second birth certificate gives him the name "Sébastien Roch" and says he was born on 22 June, of "unknown parents", and some scholars argue that he was not born but baptized on that day. Local tradition said that he was the love child of an aristocratic woman, Jacqueline de Montrodeix (née Cisternes de Vinzelles), and of a clergyman named Pierre Nicolas; and that he was then given or adoption to the grocer, who was a relative of the biological father.