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==Planetary Summary==
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'''Isstvan III''' was a [[Hive World]] in the [[Isstvan system]]. Its destruction and the surrounding circumstances were the first overt signs of [[Warmaster]] [[Horus]]'s turn to the forces of [[Chaos]] and the first [[Battle of Isstvan III|battle]] of the [[Horus Heresy]].
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===Rebellion and Heresy===
*{{Main|Battle of Isstvan III}}
Baron '''[[Vardus Praal]]''', Imperial [[governor]] of the Isstvan system, eventually rose in revolt against the Imperium, purging Imperial elements for as long as six years before word of the rebellion reached the [[Council of Terra]]{{Fn|5a}}. The [[Emperor of Mankind]] and the Council, 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.
The planned first wave, all suspected loyalists, deployed by [[Drop pods]] upon '''Choral City''', the capital of the planet. Not using the traditional [[Stormbird]]s and cutting their communication lines to the fleet, Horus tried to ensure that none of them would survive the massive [[Virus bombs|virus bombardment]]. Captain [[Saul Tarvitz]] of the Emperor's Children, working on a hunch, had managed to remain in the fleet, where he discovered the planned bombardment and commandeered a [[Thunderhawk]] to save his betrayed brethren. Thanks to Tarvitz's warning, a few hundred loyal Space Marines managed to survive inside airtight bunkers and bomb shelters. As the putrid gases resulting from the rapidly decaying organic matter filled the atmosphere, Horus ignited a firestorm on the planet which melted the hives and razed the cities. The psychic death scream of the twelve billion is said to have been louder than the [[Astronomican]]{{Fn|1}}{{Fn|2}}{{Fn|3}}.
Isstvan III would remain a barren, quarantined world. However 10,000 years later the sole survivor of the original atrocity, the [[Dreadnought]] [[Rylanor]], enacted his revenge. Using a sonic beacon to draw [[Fulgrim]] to the world, Rylanor detonated an unexploded [[Virus Bomb]]. Once again Isstvan III was scoured of whatever life had redeveloped over the millennia, but Fulgrim managed to survive.{{Fn|6}}
==Isstvan and Istvaan==
The system and planet's name is alternatively spelled '''Istvaan'''{{Fn|3}}.
==See AlsoRelated Articles==
*[[Planets (List)]]
==Sources==
{{Cite}}
*{{Endn|1}}: [[Galaxy in Flames (Novel)|Galaxy in Flames]] by [[Ben Counter]]
*{{Endn|2}}: [[Realm of Chaos: Slaves to Darkness]], pg. 240
*{{Endn|3}}: [[Codex: Chaos Space Marines (3rd Edition, 2nd Codex)]], pg. 5
*{{Endn|4}}: [[Fallen Angels (Novel)|Fallen Angels]] by [[Mike Lee]], {{Cite This}}
*5: [[The Horus Heresy Book One - Betrayal]] **{{Endn|5a}}: pg.40**{{Endn|5b}}: pgpgs.36-3936–39*{{Endn|5}}: [[Sons of the Emperor (Anthology)]] - — ''The Ancient Awaits''
[[Category:Dead Worlds]]
[[Category:The Great Crusade]]
