Uranus, one of the original deities, was born to Gaia, who is the inspiration for modern-day Mother Earth. With his mother, he made twelve children. These were all the titans. At first, they gave birth to a horrid beast with fifty heads and a hundred hands.
Its name was Hecatonchires. They were so repulsed by this monster that they threw him into Tartarus. After that, they tried again, but were gifted with the horrible Cyclopes.
Again, they threw him into Tartarus. On the third try, they succeeded. And soon enough, they had twelve children. Eventually, Cronus kills his father Uranus, and curses his son to have the same fate as he.