Hyperion was born in the first generation of the cosmos, one of the twelve children of Uranus and Gaia, the primordial sky and earth whose union produced every god and monster that followed. His brothers were Oceanus, the river that encircles the world; Coeus, the Titan of the north; Crius, the Titan of the south; Iapetus, the Titan of the west; and Cronus, the youngest and most terrible, who hated their father from the moment he was born. His sisters were Theia, the shining one; Rhea, who would become the mother of Zeus; Themis, the goddess of divine law; Mnemosyne, the goddess of memory; Phoebe, the bright one; and Tethys, the wife of Oceanus. Together they were the Titans, the strainers, so called by Uranus because they strained to do the fearful deed that would one day cast him down.

Uranus was a tyrant. He hated all his children, but he reserved his deepest loathing for the monstrous offspring that Gaia bore after the Titans: the three Cyclopes, Brontes, Steropes, and Arges, each with a single eye in the centre of his forehead; and the three Hecatoncheires, Cottus, Briareus, and Gyes, each with a hundred arms and fifty heads. Uranus pushed these six back into the womb of Gaia as soon as they were born, hiding them in the secret places of the earth, and Gaia groaned in pain and rage. She fashioned a sickle from grey flint and called her twelve Titan children to her. She told them of her plan: punish their father for his cruelty. Fear seized them all. Only Cronus, the youngest, had the courage to answer. But Cronus could not hold Uranus alone. He needed his brothers, and Hyperion was one of the four who stepped forward.

When Uranus descended from the sky to lie with Gaia, bringing night with him, the four brothers were waiting. Hyperion, Coeus, Crius, and Iapetus seized their father and held him fast, each gripping a limb, while Cronus struck with the sickle. The blood that fell to earth produced the Erinyes, the ancient goddesses of vengeance; the Giants, the armoured warriors who would one day challenge the Olympians; and the Meliae, the ash-tree nymphs. The severed genitals fell into the sea, and from the white foam rose Aphrodite, the goddess of love and beauty. The deed was done, and the Titans were free. But it was a freedom bought with blood, and the cycle of violence had only begun. Uranus, in his dying curse, prophesied that Cronus too would be overthrown by his own son, and the prophecy would come true.

After the fall of Uranus, Cronus became king of the cosmos, and the Titans ruled. Hyperion married his sister Theia, the Titaness whose name means divine or shining, the goddess of sight and the radiance that makes perception possible. Their union was more than a marriage of convenience; it was a cosmological pairing. Hyperion was the active principle of light, the one who goes above, the traversal of the sky. Theia was the faculty of sight, the ability to perceive and be illuminated. Together they produced the three lights of heaven: Eos, the dawn, whose rosy fingers paint the eastern sky each morning and who opens the gates of heaven for her brother to pass; Helios, the sun, who drives his golden chariot drawn by four winged horses from the eastern land of the Ethiopians to the western garden of the Hesperides, the nymphs of the evening; and Selene, the moon, who rides her silver car through the night when her brother has descended, illuminating the darkness with her pale and changeable light. These three children were the luminous triad of the pre-Olympian cosmos, governing the complete cycle of celestial light: dawn, day, and night illumination.

Hyperion's relationship with his children was closer and more confusingly intimate than that of most Titans. In the earliest strata of Greek poetry, the distinction between Hyperion and Helios was not sharply maintained. Homer, in both the Iliad and the Odyssey, uses "Hyperion" as an epithet for the sun god himself, referring to Helios as "Hyperion's son" or simply as "Hyperion" interchangeably. This conflation suggests that in the oldest layer of Greek thought, the Titan of heavenly light and the god who drove the sun chariot were aspects of a single divine luminosity. The father was the light, and the son was the light made visible. It was only in later mythography, particularly in the works of Apollodorus and the Roman poets, that the two were firmly separated: Hyperion the imprisoned Titan, Helios the functioning sun god. But in the Homeric poems, the names blur together like the sun and its radiance, inseparable.

When Zeus, the son of Cronus and Rhea, grew to manhood in hiding on Crete, he returned to overthrow his father and free his swallowed siblings: Hestia, Demeter, Hera, Hades, and Poseidon. The war that followed was called the Titanomachy, the battle of the Titans, and it lasted ten years, shaking the cosmos to its foundations. Zeus freed the Cyclopes from Tartarus, where Cronus had imprisoned them, and they forged for him the thunderbolt, the weapon that would decide the war. He freed the Hecatoncheires, and their hundred arms rained boulders upon the Titan ranks. Hyperion fought on the side of Cronus, as did most of his brothers, for the Titans were defending the order they had established against the upstart Olympians. But the new gods were stronger, and the old gods were defeated.

The vanquished Titans were cast into Tartarus, the pit beneath the world, a void located beneath the foundations of all, where earth, sea, and sky have their roots. Hesiod describes it as a place as far beneath the earth as the earth is beneath the heaven, a bronze-walled prison where the winds blow in all directions and where the Titans were guarded by the Hecatoncheires themselves. Hyperion was among them, the Titan of light condemned to darkness, the watcher from above cast into the depths below. But his imprisonment did not extinguish his legacy. His children continued their celestial functions uninterrupted. Helios still drove his golden chariot from east to west each day. Selene still crossed the night sky in her silver car. Eos still opened the gates of heaven each morning with her rosy fingers. The Olympian victory changed the political hierarchy of the cosmos but did not alter the physical phenomena governed by Hyperion's descendants. Light continued to function as it had under Titan sovereignty, a continuity that distinguished Hyperion's family from those Titans whose domains were directly usurped by Zeus and his siblings.

In the lost play Prometheus Unbound by Aeschylus, the chorus consisted of the Titan sons of Uranus, including Hyperion, released from Tartarus by the clemency of Zeus. Whether this release was permanent or merely a dramatic device, the sources do not agree. Some traditions hold that the Titans were eventually freed, their ancient anger cooled by time. Others keep them in Tartarus forever, a warning to any who would challenge the king of the gods. But Hyperion's name endured. It passed into astronomy, where it was given to a moon of Saturn, discovered in 1848, a small irregular body that tumbles chaotically through space, its rotation unpredictable, as if the Titan of light had become a fragment of chaos. And in modern literature, the name has been used for spaceships, for novels, for characters who embody the old light before the new gods took over, a reminder that even the most ancient powers can be imprisoned but not entirely forgotten.