Cronus
As per Greek Mythology, Uranus drew the enmity of Cronus's mother, Gaia, when he hid the gigantic youngest children of Gaia, the hundred-handed Hecatonchires and one-eyed Cyclopes, in Tartarus, so that they would not see the light. Gaia created a great stone sickle and gathered together Cronus and his brothers to persuade them to castrate Uranus.
Only Cronus was willing to do the deed, so Gaia gave him the sickle and placed him in ambush. When Uranus met with Gaia, Cronus attacked him with the sickle, castrating him and casting his testicles into the sea and finally killing him.
