Throughout history fables have been a popular method of giving instruction. Fables contain a short narrative that seeks to illustrate a hidden message. Generally, fables use animals or objects as part of the narrative yet the message is designed to apply to humans. By doing this, the fabulist is not perceived as the teacher and this reduces any bias the listeners might have against the person. The most famous fabulist would be Aesop who most date around 620 B.C. Many fables are attributed to Aesop, but it's unclear how many he actually wrote; indeed, his historical existence as a person is under question.  Here is a collection of  over 300 of Aesop's classics.