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The '''Palace Coup''' was an attempted coup by dissatisfied members of the [[Imperium]] towards the end of the [[Unification Wars]].{{Fn|1}}

{{Spoiler | source = Valdor: Birth of the Imperium (Novel)}}

The conspiracy was led by [[Grand Provost Marshal]] [[Uwoma Kandawire]], [[Thunder Warriors]] [[Primarch]] [[Ushotan]], and [[Biotechnical Division]] head [[Amar Astarte]]. The conspirators intended to remove [[Constantin Valdor]] from power and put him on trial for the massacre of the Thunder Warriors at Mt. Ararat without consent of the [[High Lords of Terra]]. They did not intend to oust the Emperor, but rather intended to let him have the final judgement on Valdor's fate.{{Fn|1a}} However this was only the true goal of Kandawire. Amar Astarte had grown to believe the [[Primarch Project]] and raising of the [[Legiones Astartes]] doomed without the Primarch's available, while Ushotan simply sought revenge. The conspirators drew upon a variety of forces, from mercenaries to soldiers of fortune to [[Imperial Army]] units loyal to Kandwaire. At their core were Thunder Warriors under Ushotan and Amar Astarte's [[Castellan Exemplars]], genetically engineered to be loyal only to her.{{Fn|1b}}

Ultimately, the coup was doomed from the very start and the Custodes were well aware of its planning even before it began. Surprisingly, Kandawire was granted amnesty and allowed to retire peacefully on Terra outside the walls of the Palace. The destroyed Imperial Dungeon meanwhile was cleared for use as the nexus of the [[Webway Project]]. [[Malcador the Sigillite|Malcador]] returned to Terra shortly after the conspiracy had been put down, apparently having been on [[Luna]] preparing for the [[First Pacification of Luna|imminent assault there]] with the Emperor.{{Fn|1f}}

*{{Endn|1}}: [[Valdor: Birth of the Imperium (Novel)]]

**{{Endn|1a}}: Chapter 10