In Aztec mythology, Cihuacoatl ("snake woman"; also Chihucoatl, Ciucoatl) was a fertility goddess and patron of mothers, particularly women who died in childbirth. She helped Quetzalcoatl make the current age of humanity by grounding up bones from the previous ages, and mixing it with his blood. She is the mother of Mixcoatl; she abandoned him at a crossroads, and tradition says that she often returns there to weep for her lost son, only to find a sacrificial knife. She ruled over the Ciuteoteo.
Compare: La Llorona