Mark Twain 
A Connecticut Yankee in King Arthur’s Court (Diversion Illustrated Classics) [EPUB ebook] 

Introducing Diversion Classics, an illustrated series that showcases great works of literature from the world’s most beloved authors.
When an accident knocks mechanic Hank Morgan from nineteenth-century Connecticut back to sixth-century Camelot, he finds himself in a new position of power. Armed with his knowledge of the future, Hank sets off on a quest to transform his destiny and prevent King Arthur’s death. With his trademark dark humor, Mark Twain crafts a critique of human nature that transcends the centuries between King Arthur, Hank Morgan, and today.