Mark Twain 
A Connecticut Yankee in King Arthur’s Court [EPUB ebook] 

A man named Hank Morgan, also known as the
Yankee, works at a factory in Hartford, Connecticut in the late 1800s. During a fight, Hank is hit in the head and loses consciousness. He wakes up in a strange place, under an oak tree on the outskirts of Camelot…
‘A Connecticut Yankee in King Arthur’s Court’ was written in 1889 by Mark Twain. This novel is a satire of life in the Middle Ages, and is considered by many to be one of the earliest science fiction books.