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From Warhammer 40k - Lexicanum
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{{PlanetsPortal}}
'''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]].
{{PlanetsPlanet
|Map=Galaxy map ultimasegmentum.jpg
|Cross X=170
|Cross Y=60
|Cross Text=Isstvan
|Planetary Image=IsstvanIII.jpg
|Name=Isstvan III
