Asajj was from the barbaric planet Rattatak. There, she was raised as a Padawan by Ky Narec, a Jedi Knight who had crashed there and unable to escape. After his death, Asajj's rage consumed her and she turned to the Dark Side.
She eventually drew the attention of Count Dooku, joining the Confederacy of Independent Systems during the Clone Wars. She was desperate to learn the ways of the Sith, but settled for his Dark Acolytes for the time being.Ventress dueled with both Anakin Skywalker and Obi-Wan Kenobi many times, until she finally faked her own death during the Battle Of Boz Pity in order to just get the hell away from all these stupid men.