Whipping Boy.
A whipping boy was a young boy who was assigned to a young prince and was punished when the prince misbehaved or fell behind in his schooling. They were created because of the idea of the divine right of kings, which stated that kings were appointed by God, and implied that no one but the king was worthy of punishing the king’s son. Since the king was rarely around to punish his son when necessary, tutors to the young prince found it extremely difficult to enforce rules or learning.Because the prince and whipping boy grew up together they usually formed a strong emotional bond, especially since the prince usually did not have playmates as other children would have had. The strong bond that developed between a prince and his whipping boy dramatically increased the effectiveness of using a whipping boy as a form of punishment for a prince. The idea of the whipping boys was that seeing a friend being whipped or beaten for something that he had done wrong would be likely to ensure that the prince would not make the same mistake again
It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt...
-Mark Twain