Hesiod, a poet from Boeotia, who must have lived around 700 BC, has written the “Theogony” (genealogy of the Gods) where he is talking about the creation of the world and the genesis of gods. So, Hsiod says that Chaos, Earth (Gaia) and Eros (Love) were created first. Then, Chaos produced Erevos and Night which produced Aethera, Imera (Day). Continuously Earth produced the Sky (Uranos), the Mountains (Oroi) and the Sea (Pontos).

The Earth coupled with the Sky and gave birth to the Titans who were 6 male (Okeanos, Iapetos, Koios, Krios, Hyperion, Kronos) and six female (Rhea, Theia, Mnemosyne, Themis, Phoebe, Tethys), to the Cyclops and the Hekatoncheires.
Uranos was the king of the world yet he was afraid of losing his power by his children, he used to lock them away. However, Gaia could not accept the locking of her children so she conspired against him with Kronos, the youngest of her children. So, as Uranos was sleeping embraced by his wife, Kronos cut his genitals and threw them in the sea. Aphrodite was then born from the thrown genitals. Then, Kronos took the power and set his brothers free. He imprisoned the Cyclopes and the Hekatoncheires and got married to his sister, Rhea, giving birth to Hera, Demeter, Hestia, Zeus, Poseidon and Hades.

Okeanos got also married to his sister, Tethys, and they gave birth to the rivers and the Okeanides.

Kronos feared of losing his power by his children just like his own father so he used to gobble them once they were born. Rhea, just like her mother, tricked him when she gave birth to her last child, Zeus, by hiding him in on Ida mountain, Crete, and giving her husband a stone wrapped in the baby’s clothes to swallow.

Raised by the nymphs and fed by Amaltheia, a goat, he took the throne of his father and made him vomit his brothers and sisters. Then, he shared his power with his brothers by becoming lord of the universe himself and letting Poseidon rule the sea and Hades rule the underworld. Supported by his brothers and sister who hated Kronos, Zeus and the other Gods fought against Kronos and his brothers, the Titans.

They had been fighting for ten yeasr without any of them getting defeated. So, Rhea advised Zeus to free the Cyclopes and the Hekatogcheires, who had been imprisoned by Kronos, and ask for their help. The Cyclopes provided Zeus with thunderbolts and the Hekatogcheires crushed the Titans with huge boulders. Finally, the Gods, who were based on the mountain Olympus, won the battle with the Titans who were based on the mountain Othrys.

The Gods used to live on Olympus yet some of them had their own palaces on several parts. They had various marriages with men, nymphs and other Gods including several love adventures and conjugal infidelities.