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The '''Isstvan System''' is a [[System]] of the [[Imperium|Imperial space]]. Located in [[Ultima Segmentum]], it is an unremarkable and sparsely populated eight-planet system far from [[Terra]]. The system is most notable for being the location of the first battles of the [[Horus Heresy]]: the [[Battle of Isstvan III]] and the [[Drop Site Massacre]].{{Fn|1}}

*[[Isstvan I: ]] - Pre-Compliance human mining outpost; tithe exempt.*[[Isstvan II: ]] - Gas giant; primary satellite host to lower order autochthonic anomalies.*[[Isstvan III]]: - Mortis Terribelum; wreckage field in orbit; Status Unknown; ''Ad Temperesta'' augur mission in progress.*[[Isstvan IV: ]] - Secondary system augury node; Therion Fleet auxillia, tracking lock terminated.*[[Isstvan V]]: - Target Prioris; Legiones Astartes Execution Fleet inbound; Status Unknown; ''Ad Temperesta'' augur mission in progress.*[[Isstvan VI: ]] - Gas giant. Primary satellite host to pre-Compliance outpost, 34 minor satellites pending survey.*[[Isstvan VII: ]] - [[Xenos]] structures detected; surface survey pending.*[[Isstvan VIII: ]] - Dwarf planet; host to pre-Compliance outcast elements. Suppression operation pending.*[[Isstvan Asteroid Range: ]] - Remnants of planetary cataclysm; Cross-Ref: extinct autochthon xenos/ruins on Isstvan I and V. Some evidence of pre-Complaince outcast activity.*[[Isstvan Extremis: ]] - Augury network nexus; silenced prior to Isstvan III atrocity.

*{{Endn|1}}: [[The First Heretic (Novel)]] , Chapter 24*{{Endn|2}}: [[The Horus Heresy Book Two - Massacre]] , pgs. 24-25