of San Silvestro al Quirinale (c. 1628) and San Carlo ai Catinari (1628–30). In spite of his activity in Rome, Domenichino decided to leave the city in 1631 to take up the most prestigious, and very lucrative, commission in Naples, the decoration of the Cappella del Tesoro di San Gennaro of the Naples Cathedral. His Scenes from the Life of San Gennaro occupied him for the rest of his life. He painted four large lunettes, four pendentives, and twelve scenes in the soffits of the arches, all in fresco, plus three large altarpieces in oil on copper. He died, perhaps by poison at the hands of the jealous Cabal of Naples, before completing the fourth altarpiece or the cupola, which was subsequently frescoed by Lanfranco. At the time of his death, Domenichino's chief assistant was an obscure painter from Assisi, Francesco Raspantino, who inherited his master's studio. Earlier, Domenichino's principal pupils were Alessandro Fortuna, Giovanni Battista Ruggieri, Antonio Alberti called Barbalonga, Francesco Cozza, Andrea Camassei, and Giovanni Angelo Canini. Others who studied in his studio include Poussin, Pietro Testa, and his future biographer, Giovanni Pietro Bellori. Ideas on art Domenichino's work, developed principally from Raphael's and the Carracci's examples, mirrors the theoretical ideas of his friend Giovanni Battista Agucchi, with whom the painter collaborated on a Treatise on Painting. The portrait of Agucchi in York used to be attributed to Domenichino, but is now thought to be by Annibale Carracci, another friend. It represents what would become known as classic-idealist art, which aims to surpass the imperfections of nature by developing an "Idea of Beauty" (idea del bello) through the study and imitation of the best examples of ancient and Renaissance art. Imitation in this sense is not copying but a creative process inspired by rhetorical theory whereby revered models are not only emulated but surpassed. One of the most famous incidents in the history of art that centered on concepts of Imitation arose when Lanfranco accused Domenichino of plagiarism, specifically of having stolen the design of his great Last Communion of St. Jerome from an altarpiece of the same subject in Bologna by his former teacher, Agostino Carracci. To prove his point, Lanfranco circulated a print after Agostino's painting, prompting painters and critics to take sides, most of whom—including Poussin and the antiquarian-critic-biographer Bellori—strongly defended Domenichino's work as being praiseworthy imitation. In addition to his interest in the theory