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{{main|Severan Dominate}}The Imperium keeps a tight grip over its planets, yet every now and then planets or groups of planets do attempt to secede from the Imperium. This may be the result of the [[Planetary Governor]] believing he can get away with independence, or it may be the result of revolution that deposes those in power. Many of these successions are orchestrated by the powers of [[Chaos]], and the humans that are part of it should be counted as the Lost and the Damned, however there are also occasions when a planet decides it wants to be independent of the Imperium through its own volition, such as the case of the [[Severan Dominate]], or the [[Kingdom of Vanir]]. Regardless of the cause, these independent realms rarely last long as they are swiftly and brutally subjugated back into the Imperium.