Originated from the god who governs earth in Sumerian mythology. As a sister and wife of Enlil, she was at the highest position as a goddess. She created the first humans from lumps of clay. As she, the goddess of fertility, was venerated as the guardian of Assyrian kings, she had been enthusiastically worshiped in Assyria. Hehehe. Maybe the reason she was enthusiastically worshiped is... because of something else?