The Titans: Precursors to the Olympian Gods
United with his siblings, Zeus waged a decade-long war against Cronus and the Titans – the Titanomachy

When we think of Greek mythology, names like Zeus, Poseidon, and Hades often come to mind. These powerful Olympian gods, each ruling over their respective domains – the sky, the seas, and the underworld – represent the pinnacle of divine power in the Greek pantheon. However, before the Olympians ascended to their thrones, another generation of gods held sway: the Titans.
Though often depicted as less benevolent than their Olympian successors, the Titans presided over a period considered a Golden Age, an era that ultimately ended with the Olympian uprising.

Children of Earth and Heaven
The Titans were the offspring of the primordial deities Gaia (Earth) and Ouranos (Sky). Ironically, it was Ouranos himself who bestowed the name "Titans" upon his children after they violently overthrew him. He cursed them, foretelling their eventual downfall. The poet Hesiod, in his Theogony, suggests the name "Titans" derives from the Greek words "τιταίνω" (to strain) and "τίσις" (vengeance or retribution).
While modern scholars dismiss this etymology, Hesiod's portrayal of these early deities certainly emphasizes their eventual punishment, setting the stage for the narrative of their demise. Scholars believe the story of the Titans originated in the Near East, mirroring the Hurro-Hittite succession myths, particularly the transition of power from Ouranos to Cronus and subsequently from Cronus to Zeus.

The Elder Titans
Hesiod's Theogony provides the earliest account of the Titans, listing twelve children of Ouranos and Gaia: Oceanus (god of the world-encircling river), Coeus (god of intelligence), Crius (god of constellations), Iapetus (god of mortality), Hyperion (god of light), Cronus (god of time), Theia (goddess of light and sight), Rhea (goddess of fertility), Themis (goddess of law and order), Mnemosyne (goddess of memory), Tethys (goddess of fresh water), and Phoebe (goddess of intellect).

Importantly, while later authors expanded this list, Ouranos's use of the term "Titans" was a curse rather than a generational classification. Other offspring of Gaia and Ouranos, such as the Cyclopes, Hecatonchires (Hundred-Handers), Furies, and even Aphrodite (according to Hesiod’s account), were not considered Titans. Upon seizing power, the Titans structured the world according to their will, intermarrying and producing further divine offspring.
The Younger Titans
Later Greek writers broadened the definition of "Titan" to encompass the immediate descendants of the original twelve, effectively changing the term to signify the generation preceding the Olympians. Among the most prominent younger Titans are the sons of Iapetus and Clymene: Prometheus (creator of mankind and thief of fire), Epimetheus (husband of Pandora), and Atlas (bearer of the heavens). Prometheus's defiance of Zeus led to his eternal punishment: chained to a rock while an eagle devoured his regenerating liver.

Another important lineage is that of Hyperion and Theia, who birthed Helios (sun god), Selene (moon goddess), and Eos (dawn goddess). Helios played a role in the tale of Aphrodite's infidelity with Ares. Selene nursed the Nemean Lion, slain by Heracles, and sent the gadfly that caused the death of Dionysus’s lover, Ampelos. Eos, cursed by Aphrodite with insatiable desire, fell for Orion, ultimately leading to his demise at the hands of Artemis.

The Overthrow of Ouranos
Gaia and Ouranos produced six more children: the Cyclopes (one-eyed giants) and the Hecatonchires (hundred-handed giants). Disgusted by their appearance, Ouranos imprisoned them within Gaia, causing her immense pain. In retaliation, Gaia forged a sickle and pleaded with her children to help her overthrow their father. Only Cronus, the youngest, accepted the challenge. Gaia concealed Cronus, armed him with the sickle, and revealed her plan.

When Ouranos next approached Gaia, Cronus ambushed him, castrating him with the sickle and throwing his severed genitals into the sea. From the spilled blood arose the Furies, goddesses of vengeance, and the Giants. From the sea foam generated by the castrated genitals, Aphrodite emerged. While Hesiod claims Cronus acted alone, Apollodorus attributes the attack to all of Ouranos's children except Oceanus. Regardless, Ouranos cursed all his offspring, naming them Titans.
The Rise of Cronus
While many accounts depict Cronus immediately assuming power after Ouranos's castration, other versions suggest an interim rule by Ophion and Eurynome. This narrative likely stems from the Orphic tradition, a mystery cult focused on Dionysus's resurrection and the songs of Orpheus.
In Apollonius of Rhodes's Argonautica, Orpheus sings of Ophion and Eurynome, daughter of Oceanus, as the first rulers, later dethroned by Cronus and Rhea. However, the identities of Ophion and Eurynome are debated. Some equate them with Ouranos and Gaia, while others link them to Oceanus and Tethys. The Orphic narrative adds a layer of complexity to the succession myth.

The Birth of the Olympians
Cronus and Rhea had six children: Hestia, Demeter, Hera, Hades, Poseidon, and Zeus. Fearing a prophecy foretelling his overthrow by a son, Cronus swallowed each child upon birth. Distressed, Rhea sought help from her parents, Gaia and Ouranos, to save her children and avenge Cronus's cruelty.
Rhea secretly gave birth to Zeus in Crete, substituting a stone wrapped in swaddling clothes for Cronus to swallow. Upon reaching adulthood, Zeus, aided by Rhea and Gaia, forced Cronus to disgorge his siblings.

The Titanomachy
United with his siblings, Zeus waged a decade-long war against Cronus and the Titans – the Titanomachy. Hesiod’s Theogony offers the most detailed account, describing Zeus freeing the Cyclopes and Hecatonchires and enlisting their aid.
The Hecatonchires bombarded the Titans with boulders, shaking the earth. Zeus, armed with thunderbolts forged by the Cyclopes, joined the battle, ultimately casting the Titans into Tartarus, a dark abyss within the underworld, where they were imprisoned.
The Aftermath and Rise of Zeus
Even after the Titans' defeat, divine conflict continued. Gaia birthed Typhoeus, a monstrous serpentine creature, possibly to avenge the Titans, though textual evidence is lacking. Zeus battled Typhoeus, eventually vanquishing him with his thunderbolts. With all rivals defeated, Zeus ascended to his throne as king of gods and men, ushering in the age of the Olympians.