"The Sleeper Awakes" by H. G. Wells is a dystopian science fiction novel published in 1899 and revised in 1910. A man falls into a coma in 1897 London and awakens 203 years later to discover he has become the world's wealthiest person. His fortune has been used to create a vast plutocratic order controlling half the world. Caught between rival factions and revolutionary forces, he must navigate a nightmarish future society where workers live in misery and his own role as figurehead threatens humanity's freedom.
Wikipedia page about this book: en.wikipedia.org/wiki/The_Sleeper_Awakes