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From Warhammer 40k - Lexicanum
not at all relevant to the planet
Due to the developments at [[Prospero]] the rebellion would be further strengthened by [[Magnus the Red]] and his Legion, the [[Thousand Sons]], servants of [[Tzeentch]]. Horus had nine Space Marine Legions and had all but destroyed three loyal ones. The way to [[Terra]] was wide open, and the [[Battle of Terra]] would follow.
==Trivia==
===Conflicting sources===
*The system/planet's name is alternatively spelled '''Istvaan'''.{{Fn|3}}
*An older version of this battle reports that initially the Emperor was quite reluctant to crush the revolt, as the reasons of the Warmaster were unknown. [[Fulgrim]] initially tried to reason and negotiate with the Warmaster only to be seduced by the powers of [[Slaanesh]].{{Fn|1}}
*One map shows Isstvan closer to [[Segmentum Obscurus]].{{Fn|6}}
*{{Endn|5}}: [[The Horus Heresy Book Two - Massacre]], pg. 26 (sidebar)
*{{Endn|6}}: [[The Horus Heresy Book One - Betrayal]], [[:File:ImperiMap.jpg|pg. 1]]
[[Category:Other Worlds]]