In Greek mythology and later Roman mythology, the Cyclops is a giant one-eyed creature. There are three groups of Cyclopes. In Hesiod's Theogony, they are the brothers Brontes, Steropes, and Arges, who provided Zeus with his weapon the thunderbolt. In Homer's Odyssey, they are an uncivilized group of shepherds, the brethren of Polyphemus encountered by Odysseus. Cyclopes were also famous as the builders of the Cyclopean walls of Mycenae and Tiryns. The fifth-century BC playwright Euripides wrote a satyr play entitled Cyclops, about Odysseus' encounter with Polyphemus. Mentions of the Hesiodic and the wall-builder Cyclopes also figure in his plays. The third-century BC poet Callimachus makes the Hesiodic Cyclopes the assistants of smith-god Hephaestus. So does Virgil in his Latin epic Aeneid, where he seems to equate the Hesiodic and Homeric Cyclopes.