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The '''Isstvan System''' is a [[System]] of the [[Imperium]]. 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 some of the most notable first battles of the [[Horus Heresy]], such as : the [[Battle of Isstvan III]] and the [[Drop Site Massacre]].{{Fn|1}}

The Isstvan system comprised the following elements previous and their conditions prior to the Drop Site Massacre{{Fn|2}}:

*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.*Isstvan VII: [[Xenos]] structures detected; surface survey pending.*Isstvan VIII: Dwarf planet; host to pre-Complaince Compliance outcast elements. Suppression operation pending.