"The Butlerian Jihad was a cataclysmic, millennia-long holy war that completely eradicated artificial intelligence, computers, and sentient robots from human civilization. Taking place over 10,000 years before the events of the original novel, the Jihad was a violent reaction to humanity's over-reliance on and eventual enslavement by "thinking machines". The ban on advanced AI became a foundational law of the Galactic Imperium."