Greeks had a very complicated beginning of the world, filled with blood.
One if the first gods was Gaia who was the Earth, and Uranus who was the sky. Eventually Uranus and Gaia got married.
Cronus was the youngest of the 12 children. Gaia who now hated her husband and filled her children with horrible tales of him. They were to willing to succeed their mothers plan of murder.
I'm Chronos the titian of time
Gaia invited Chronus to a dinner, where 5 of there children ambush him. While 4 held him down and Chronus ripped him to pieces, and flung his pieces into Tarturus. But, Uranus was still alive because you can't kill a god. Before his death, Uranus predicted that one of his kids would overthrow him.
Chronus had 12 children, the gods of Olympus. He swallowed the kids whole, in fear of each one being more powerful, expect for Zeus, which he was tricked out of swallowing.. Zeus later freed his siblings and started a 12 year long war witch they won.
After the gods won, Chronus was exiled, and the gods took his place. Zeus was now king of the gods/god of storms. Poseidon his older brother/god of the sea. Hades the oldest of the brothers/god of the underworld. The the throne room on Olympus was filled with sisters and children.