Aesop's Fables were purportedly written by a single, talented individual who may have lived about 2,600 years ago. Of course, there are so few actual documents of repute or reliability from that era, that it is very hard to be sure such an individual ever existed or that all the tales attributed to him were his own.
In any event, what is certain is this: the fables themselves are pithy yet fecund with insight, and taken collectively, they constitute a classic of ancient antiquity.
To judge for yourself, sample The Grasshopper and the Ant, The Miser and His Gold, and The Fox and the Grapes. And if you find those to your taste, peruse a more comprehensive list of the fables at Bartleby.