John Addington Symonds,
Renaissance in Italy, Volumes 6 and 7…
“ His martyrdoms are inexpressibly revolting, without appeal to any sense but savage blood-lust. It seems difficult for realism, either in literature or art, not to fasten upon ugliness, vice, pain, and disease, as though these imperfections of our nature were more real than beauty, goodness, pleasure, and health. Therefore Caravaggio, the leader of a school which the Italians christened Naturalists, may be compared to Zola. A Spaniard, settled at Naples—Giuseppe Ribera, nicknamed Lo Spagnoletto—carried on Caravaggio's tradition. ”
