He died unmarried without issue and so the Misbach line of artists died out with him, though he is well known for donating two studies by his tutor Jean Bonvoisin to the Louvre Museum (St Sebastian, assigned to Clermont-Ferrand in 1876, and Paris as a Shepherd, assigned to Avranches in 1876 but destroyed during the Second World War), followed by sixteen Old Master paintings on his death, including Dirk Bouts' Lamentation of Christ (the Louvre's first acquisition after the Second French Empire).
After his father's death his mother married Sébastien-Joseph Misbach, who taught Constant from the age of three onwards and finally adopted him on 1 April 1830.
[2] He spent his youth studying painting, history, poetry and literature and was particularly devoted to the art of Nicolas Poussin.
[3] He exhibited at the Salon of Paris eleven times between 1831 and 1850, exclusively showing mythological or biblical subjects.
[4] He died unmarried at his home at 34 rue Rollin (previously rue Neuve-Saint-Étienne) in the 5th arrondissement of Paris and buried with his mother and adoptive father in the family vault in the 12th division of the cimetière du Montparnasse - the inscription on their tomb was reproduced in 1885's Revue de l'art français ancien et moderne and reads SÉPULTURE DE S.-J.