Mark Twain 
The Prince and the Pauper (Annotated) [EPUB ebook] 

In this timeless story about class and culture in sixteenth-century England, two young men—one a child of the London slums, the other an heir to the throne—switch identities.
Prince Edward accidentally swaps places with a peasant named Tom Canty. While both boys are eager to walk in the footsteps of the other, the reality of their new lifestyles frighten them.