Aesop Fables - The Bear and the Two Travellers - Never leave a friend who believes you. This important principle i well told through two friends who change upon a bear during their travels.br br Aesop's Fables or the Aesopica is a collection of fables credited to Aesop, a slave and storyteller believed to have lived in ancient Greece between 620 and 560 BCE. Of diverse origins, the stories associated with Aesop's name have descended to modern times through a number of sources. They continue to be reinterpreted in different verbal registers and in popular as well as artistic mediums.