In Greek mythology, the Cyclopes forged Zeus's thunderbolt after he freed them from Tartarus.
The three primordial Cyclopes—Brontes, Steropes, and Arges—were sons of Uranus and Gaia. Uranus imprisoned them in Tartarus, and later Cronus kept them confined. Zeus released them during his war against the Titans, gaining powerful allies for the conflict known as the Titanomachy.
In return, the Cyclopes made divine weapons: Zeus received the thunderbolt, Poseidon received a trident, and Hades received a helmet that could make its wearer invisible. These gifts helped the younger gods defeat the Titans and establish their rule.
These weapon-making Cyclopes differ from the one-eyed shepherd Polyphemus in Homer's Odyssey. Ancient Greek traditions used the same name for both groups, but they are not the same individual characters.