Hephaistos is also called Hephaestus, and he's the smith of the gods, and the god of the smiths. He made Zeus' bolt, Poseidon's trident and Hades' helmet. He's limp, and because of this, Hera threw him, her own son, down from the Olympus, so he became even limper. Hephaistos is married to Aphrodite, but he knows she's cheating on him with Ares. But for this, you have to go to Ahrodite's page. He's always pictured with his hammer.