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'''Isstvan III''' was a [[Hive World]]. Its destruction and the surrounding circumstances was the first overt sign of [[Warmaster]] [[Horus]]' turn to the forces of [[Chaos]], and the first battle of the [[Horus Heresy]].==History==
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'''Isstvan III''' was a [[Hive World]]. Its destruction and the surrounding circumstances was the first overt sign of [[Warmaster]] [[Horus]]' turn to the forces of [[Chaos]], and the first battle of the [[Horus Heresy]].
==Planetary Summary==
{{Planets
|Map=Galaxy map ultimasegmentum.jpg
}}
Baron '''Vardus Praal''', Imperial governor of the Isstvan system, had risen in revolt against the Imperium. The Emperor and the [[High Lords of Terra|Senate of the High Lords of Terra]], ignorant of the change in Horus, charged the Warmaster with crushing this rebellion. Under his command were four [[Space Marine Legion]]s; his own [[Sons of Horus]], the [[Emperor's Children]] of [[Fulgrim]], [[Mortarion]] and his [[Death Guard]], and the [[World Eaters]] led by [[Angron]]. Horus and these Primarchs had fallen to Chaos and took this opportunity to purge all suspected Loyalists from their Legions.
==Isstvan and Istvaan==
The system and planet's name is alternatively spelled '''Istvaan'''<sup>3</sup>.
==See Also==
*[[Planets (List)]]
==Sources==
