The ancient Greeks never just told a story for the sake of it, even if it was primarily to explain the existence of some natural phenomenon, like a mountain range, a constellation or even human behaviours such as jealousy or rage. Each story conveyed a deeper allegorical import that was meant to improve our understanding of how to make sense of life.
Among the most popular stories of Ancient Greece was the story of the 12 labours of Heracles (in the Roman world known as Hercules).