Hephaestus was born to Hera, the queen of the gods and wife of Zeus, though some say he was the son of both Hera and Zeus while others claim Hera conceived him alone in retaliation for Zeus giving birth to Athena from his own head. The infant was born with a twisted foot, his leg turned inward and his body imperfect. Hera, disgusted by the deformity, seized the child and cast him down from Olympus. He fell for a full day and night through the air, tumbling helplessly until he crashed into the sea near the island of Lemnos. The sea goddess Thetis, one of the fifty Nereids who attended Poseidon, found the broken child and raised him in a cave beneath the waves. There, hidden from the gods above, Hephaestus discovered fire and metal. He built his first forge in the darkness of the ocean floor, and the sparks of his hammer lit the deep like distant stars.

When he grew strong, Hephaestus did not forget his mother's cruelty. He built a golden throne of exquisite beauty and sent it to Olympus as a gift for Hera. She sat upon it, and the moment she did, invisible chains sprang from the seat and bound her fast. No god could free her. The throne was a trap of such cunning that even Zeus, the king of the gods who wielded thunder and lightning, could not undo it. The gods pleaded with Hephaestus to release his mother, but he refused. Only when Dionysus, the god of wine and ecstasy, came to him drunk and laughing and persuaded him with wine and flattery did Hephaestus relent. He returned to Olympus, freed Hera, and was welcomed among the gods as the master craftsman. But the grudge never fully died. It would resurface years later in a far more public humiliation.

Zeus, seeking to resolve the constant rivalry between the gods for the hand of Aphrodite, the goddess of love and beauty whose very presence caused desire in gods and mortals alike, gave her to Hephaestus in marriage. The lame smith and the radiant goddess were bound together, but the marriage was hollow from the start. Aphrodite had already given her heart to Ares, the god of war, a brutal and handsome figure who thrilled her where her husband bored her. The affair continued in secret, or so they believed. Hephaestus, the master of traps and invisible mechanisms, learned of their meetings. He forged a net of golden chains so fine that they were invisible to the eye, yet stronger than any iron. He hung this net above his marriage bed and pretended to leave for Lemnos. Aphrodite and Ares came together, and the net fell, catching them naked and locked in each other's arms. Hephaestus called the other gods to witness the spectacle. Apollo, the god of music and prophecy, laughed. Hermes, the messenger god who moved between worlds, joked that he would gladly be trapped in such golden chains. But the laughter was at Ares' expense, and the shame was Aphrodite's. The lovers were released only after Poseidon, the god of the sea, promised to pay the adulterer's fine if Ares failed to do so. Hephaestus had his revenge, but it did not save his marriage. Aphrodite returned to Ares, and Hephaestus returned to his forge.

In his volcanic workshops, Hephaestus created wonders that no mortal hand could match. For Achilles, the greatest Greek warrior of the Trojan War, he forged a shield of bronze and gold that showed the whole world upon its surface: cities at peace and cities at war, fields of grain and vineyards heavy with fruit, the sun and moon and stars, and the great ocean that encircled all. For Heracles, the hero forced to complete twelve impossible labors, he forged unbreakable chains. For Zeus, he hammered the thunderbolts that shook the sky. He built automata, golden servants who moved and spoke as if alive, to serve him in his forge. He constructed the bronze giant Talos to guard the island of Crete, a man of metal who circled the island three times each day and hurled rocks at any ship that approached. He built the winged chariot of Helios, the sun god, and the silver bow of Artemis, the huntress goddess. His workshop lay beneath Mount Etna in Sicily, where the volcano still smokes and rumbles, and the islanders of Lemnos claimed that the fire of his forge burned in their own volcanic hills. When the earth shook, the Greeks said it was Hephaestus hammering at his anvil.

Hephaestus was not only a maker of weapons and wonders. He was also a healer of division. When Thetis came to him begging armor for her son Achilles, who had withdrawn from the Trojan War in rage after the death of his companion Patroclus, Hephaestus welcomed her with wine and memory. He owed her his life, for she had saved him when Hera cast him down. He worked through the night, and by morning the armor was ready: a shield that showed the cosmos, a helmet that blazed like a star, greaves that fit like a second skin. When Hera and Zeus quarreled, as they often did, Hephaestus sometimes stepped between them, once even seizing Zeus by the leg and dragging him from his throne in a desperate attempt to stop a fight. The other gods laughed at the spectacle of the lame god tugging at the king of heaven, but the act was brave, and it worked. In the end, Hephaestus outlasted the wars of the gods and the passions of the heroes. His forge never cooled. His name passed to the Romans as Vulcan, and the volcanoes that still burn across the Mediterranean world carry his memory in their fire.