 Complete the following phrase:  He was a fecund producer of historic pictures and portraits. Among his works are Heliogabalus 1841, Primavera 1846, Haydée 1848, Lady Macbeth, and his masterpiece, Calling Out the Last Victims of the Reign of Terror at the Prison of Saint-Lazare Appel des dernières victimes de la Terreur dans la prison de Saint-Lazare, with portraits of the most illustrious victims. Also notable are Vive lEmpereur, based on a poem by Méry about an episode in the 