Deposing a Vassal

Deposing a Vassal is the process whereby a ruler may attempt to remove the ruler of a vassal colony and replace them or their entire House.

Codex
"When the relationship between a master and their vassal breaks down, a master may try to replace the vassal through the use of force. If the vassal is a ruler, the leader may try to back the rule of another house, or even set up a new ruling house on that colony, usually by taking the territory of the former ruling house. Similarly, if the vassal is a leader, the archon will install a new leading house, to take over the leadership of the faction.

Deposing a vassal without just cause is a dishonorable act, and a new ruling house will take many years to gain legitimacy.

A ruling house being deposed will usually fight desperately to cling on to power, and may even try to launch a full scale rebellion by drawing in support from the other ruling houses in the faction. If a ruling house gains support from other rulers, or succeeds in defeating the initial military foray by the leader, a new faction is formed that is immediately considered at war with the former faction."