Léon Bonnat
Roll studied at École des Beaux-Arts, where he was taught by Jean-Léon Gérôme, Henri-Joseph Harpignies, Charles-François Daubigny and Léon Bonnat. He painted his first landscape in 1869, and in 1870 exhibited "Environs of Baccarat" and "Evening" at Salon-de-Provence. During the Franco-Prussian war, he was a lieutenant of militia.