Mark Twain 
The Prince and the Pauper 

In this uproarious tale of mistaken identities, a poor London urchin with an uncanny resemblance to the Prince of Wales trades places with the royal heir to the throne. In this classic Mark Twain novel for all ages, young ragamuffin Tom dreams of riches and then discovers he looks exactly like the crown prince Edward. The two trade places, but must switch back before the wrong kid gets crowned the King of England!