Atlas was one of the primordial Titans. Atlas along with his brother Menoetius sided with the Titans in their war against the Olympians, the Titanomachy. His brothers Prometheus and Epimetheus weighed the odds and betrayed the other Titans by forming an alliance with the Olympians. When the Titans were defeated, many of them (including Menoetius) were confined to Tartarus, but Zeus condemned Atlas to stand at the western edge of the Gaia, the Earth and hold up Ouranos, the Sky on his shoulders, to prevent the two from resuming their primordial embrace. Atlas continues to be a commonly used icon in western culture (and advertising), as a symbol of strength or stoic endurance. He is often shown kneeling on one knee while supporting an enormous round globe on his back and shoulders. The globe originally represented the celestial sphere of ancient astronomy, rather than the earth. The use of the term atlas as a name for collections of terrestrial maps and the modern understanding of the earth as a sphere have combined to inspire the many depictions of Atlas burden as the earth.