While the actual existence of Aesop is debated, his name is associated with a large collection of animal fables that teach moral lessons. Many of these fables are still popular today, such as "The Tortoise and the Hare", "The Ant and the Grasshopper", and "The Boy Who Cried Wolf".
Other notable fable writers include:
* Jean de La Fontaine (French, 17th century)
* Bidpai (Indian, 6th century)
* Phaedrus (Roman, 1st century AD)
* Lope de Vega (Spanish, 16th-17th century)
* Leo Tolstoy (Russian, 19th century)
It's worth noting that fables have been told and written in many cultures throughout history, making it difficult to pinpoint one single "most famous" author.