Qetesh

Qetesh was a Goa'uld who once possessed the body of Vala Mal Doran. An Underlord of Camulus, Qetesh ruled over at least one world, P8X-412, where she forced the inhabitants to mine the planet's sparse Naquadah deposits. When quotas were not met she instituted both mass executions and mass torture. The Tok'ra eventually captured Qetesh, forcing the symbiote out of the body of Vala Mal Doran. She was likely killed immediately following the extraction. . She has also been at war with Ba'al (although it is not stated precisely when) and killed, according to him, 10,000 of his best Jaffa. .  She also declared war on the Goa'uld Athena which wagged a little while but they came together to find the clava thessara infinitas.

Alternate reality

 * In an alternate reality created when Ba'al changed the timeline, Qetesh was his queen. She was suspicious of his knowledge of Earth and killed him to gain power of her own. She learned about his time-travel device beforehand and she traveled to the planet where it was located, while her fleet bombarded Earth from orbit. Her Jaffa killed Daniel and Carter and mortally wound Teal'c, but Mitchell managed to have escaped through the Stargate into the past. Qetesh transported down herself, but as Teal'c died, he detonated a grenade, killing her and destroying the time-travel device.