Nana is a novel by the French naturalist author Émile Zola. Completed in 1880, Nana is the ninth installment in the 20-volume Les Rougon-Macquart series. A year before he started to write Nana, Zola did not know anything yet about the Variétés. It was Ludovic Halévy who invited him to see an operetta with him on February 15, 1878, and took him backstage. Halévy told him innumerable stories about the amorous life of the star — Anna Judic, whose ménage à trois would become the model for Rose Mignon, her husband, and Steiner — and also about famous cocottes such as Blanche d'Antigny, Anna Deslions, Delphine de Lizy, and Hortense Schneider, an amalgam of which was to serve the writer as the basis for his principal character.