Frieza became the Emperor of Universe 7 by leveraging his position as Beerus' Agent of Destruction and defeating the Galactic Patrol and its leader, the Galactic King. His rule was marked by fear and despotism, with King Cold and Beerus being the only ones with any real authority over him. Frieza controlled over 70% of Universe 7, lost his position upon death, but reclaimed it after his revival, swiftly reconstructing the Frieza Force.