The world began with several primordial beings. First came Chaos. Then Gaia, earth. And finally Eros, love. From Gaia they came Uranus, heaven, who both created the Titans. Uranus disliked his children and locked them deep within the earth. Gaia, sick of having her children imprisoned made a great sickle that she gave to her son Cronus. Cronus hid until Uranus came to lie with his mother then leapt out and sliced off his father's genitals, which fell into the sea. Cronus proceeded to release his fellow Titans from prison, and so, the age of the Titans began. Cronus married the Titan Rhea, who gave birth to most of the major gods. Cronus, scared by a prophecy that his children would take his power, imprisoned them as soon as they were born, swallowing them whole. Rhea pleaded to Gaia for help, who taking pity hid Zeus after he was born on Mount Ida in Crete. When Cronus came to eat his son, Rhea fed him a stone instead, tricking the Titan. Gaia raised Zeu...
The mysteries which were never solved and till date people are still trying to solve the mysteries.