Nammu was the primordial mother goddess, the one that gave birth to both Anu and Ki. She was the embodiment of the salt water, who has made an appearance in multiple Mesopotamian creation stories. The creation of life starts with her “mixing her water” with the water of Abzu. Later on, she fades into other beings as Enki and Ninhursag take over many of her roles in the Mesopotamian pantheon.
In Babylonia, she was known as Tiamat. In the Enuma Elish, she decides to make war on her offspring. She is not just the mother goddess for the gods, but she is also the mother of many monsters. These are the beings that she created to wage war on her children.