Tiamat

Tiamat was a Goa'uld who held power during the First Goa'uld Dynasty and posed as the Babylonian goddess of primeval chaos on Earth. She was killed near the end of the First Goa'uld Dynasty by an ashrak who became known as Marduk due to this deed. Marduk had killed her to gain the Eye of Tiamat so as to solidify his power and gain a place in the System Lords.