Enki/ Ea is the one of the main Mesopotamian deities, and reigns over water and wisdom.
Myths & Legends
When his neice, Ishtar, is taken to the underworld, Ea sends a eunuch to make a bargan with Ereshkigal. He offers pure water for the exchange for his niece. His eunuch is cursed, though Ereshkigal does release Ishtar soon after, demanding a substitute instead.