Dear child, have you ever looked at yourself in the mirror and admired how pretty or handsome you are? Well, there was a time when wise men of princes and kings believed that they had to look at themselves in a "special mirror" to see themselves in the right way.
These mirrors for princes were actually not real mirrors, but books that contained advice and guidance on how to be good rulers. They were written by famous scholars and philosophers who wanted to help the princes make wise decisions and avoid mistakes that could lead to the downfall of their kingdom.
These books were called "mirrors for princes" because they helped the rulers to reflect on their own behaviors and actions, just like a mirror allows us to reflect on our physical appearance.
The mirrors for princes advised the rulers to be just, fair, and compassionate towards their subjects, to avoid greed and corruption, and to always strive to improve themselves and their kingdom.
So, like a good friend who helps you see yourself in the best light, these mirrors for princes helped the rulers to see themselves in a positive and constructive way.