In Greek mythology, the monster known as the Erinyes (or Furies) was born from the blood of Uranus. When Uranus was castrated by his son Cronus, his blood fell to the earth, resulting in the birth of several entities, including the Erinyes. These fearsome deities represent vengeance and are deeply intertwined with themes of justice and retribution for wrongs committed, showcasing the complexity of familial bonds among the gods.