The Prince and the Pauper (1937)

On the same day two boys are born: the pauper Tom and prince Edward. As a kid, Tom sneaks into the palace garden and meets the prince. They change clothes with each other but the guards discover them and throw out the prince, since they are almost identical. Nobody believe them when they try to tell the truth. Soon after, the old king dies and the prince will inherit the throne. The evil earl of Hertford attempts to murder the prince to gain power for himself.