Even though Twain was a realist, readers notice that his writing was also influenced by author's who came before him.
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Twain's work was influenced by a number of different author and styles. These authors include Homer, Dante, Sir Thomas Malory, Cervantes, John Milton, John Bunyan, Shakespeare, Swift, Robert Browning and Charles Dickens. Note, I was able to find far more references to author's whose work he was not impressed with.... than those he was.
Mark Twain and the Brazen Serpent