This set up a simmering rivalry between the Olympian gods led by Zeus and the Titans led by Cronus. The resulting conflict is known as the Titanomachy, which lasted ten years. Eventually Zeus prevailed and the defeated Titans were banished to Tartarus with but a few exceptions. The Titan Atlas was tasked with holding the earth up safely on his shoulders; the Titan brothers Epimetheus and Prometheus, who had sided with Zeus, were tasked with creating the first mortal men instead of being banished.