The Sector Governance Decree instituted towards the end of the Clone Wars placed planetary governors on every planet in the Republic, along with their own regiments of clone troopers as security forces. Many of Supreme Chancellor Palpatine's lackeys and supporters were given the position as reward for their loyalty.
After the Republic transitioned in the Empire, the Planetary Governors themselves came under the supervision of the Sector Governors, the Moffs. Governors were seldom native to their planets, so that they wouldn't interfere with local politicking. They were instructed to let local politicians run their own affairs unless such courses of action conflicted with Imperial goals.
- Star Wars Episode III: Revenge of the Sith (novel)
- The Abduction