Edict of Restraint
Proclaimed by Lord Commander Roboute Guilliman in cooperation with Adeptus Custodes Captain-General Constantin Valdor in the aftermath of the Horus Heresy, the Edict tied the Custodes to Terra and forbid them from leaving the planet in force. Though the Custodes did leave the Sol System in small numbers under specific circumstances several times, they would not go to war in force for the next 10,000 years. However in the closing days of the 13th Black Crusade many within the Imperium such as Chancellor of the Senatorum Imperialis Lev Tieron saw the Custodes as the only hope for the Imperium and wished to have the High Lords of Terra repeal the Edict. Since the forming of the Great Rift and the return of Guilliman the Edict has since been dissolved and the Custodes now go to war again.
- 1: Watchers of the Throne: The Emperor's Legion (Novel) Chapter 10 Tieron