What novel sequence by the husband of Eveline Hańska is generally viewed as his "magnum opus"?
Ewelina Hańska: Eveline Hańska (Ewelina, née Rzewuska, 6 January c. 1805 – 11 April 1882) was a Polish noblewoman best known for her marriage to French novelist Honoré de Balzac. Honoré de Balzac:  The novel sequence "La Comédie Humaine", which presents a panorama of post-Napoleonic French life, is generally viewed as his "magnum opus".
"La Comédie Humaine"