The Mama Bears of Game of Thrones
This trope killed the show.
Demeter (or Ceres in the Roman tradition) is the Greek Goddess of the harvest. Other traditions describe her as ruler of the poppy, a guardian of the underworld, and, more generally, mother Earth. Sometimes she is depicted in flowing robes holding grain. Other times she is vengefully bringing about the first winter. She is perhaps most famously known as the mother of Persephone.