Changes

* {|border="0" cellpadding="2" cellspacing="1" style="margin-left:1em; margin-right:1em; margin-bottom:1em; background:#4F4F4F;"!Year!Event!Source|-style="background:#707070;"||[[Roboute Guilliman]] compiles the first [[Codex Astartes]], which lays down the new organizational doctrine for [[Space Marine]] chapters.* ||-style="background:#707070;"||012.M31 |Scouring of [[Isstvan III]]. [[Warmaster]] [[Horus]], with 4 other traitor Legions, virus bombs Isstvan III to supress a minor rebellion. Frigate [[Einstein]] escape with news of Horus' corrupt activities.* ||-style="background:#707070;"|013.M31 |[[Horus Heresy]]. Seven legions Legion sent against Horus, but four defect to his side and three are destroyed. Marine fight Marine in battles across the Galaxy.* |Codex: Space Marines 3rd ed|-style="background:#707070;"|014.M31 |[[Siege of Earth]]. Horus lays siege to the [[Emperor]]'s Palace. The Emperor teleports onboard Horus' [[battle barge]]. [[Sanguineous]] killed. Horus mortally wounded. Emperor wounded, and placed in the [[Golden Throne]].* |WD161|-style="background:#707070;"|014-021.M31 |[[Great Scouring]]. Rebel forces throughout the galaxy are quelled. [[Chaos]] forces retreat into the [[Eye of Terror]].* ||-style="background:#707070;"|021.M31 |[[Second Founding]]. Marine Legions broken into chapters. 23 new chapters created. [[Grey Knights]] secretly created.* ||-style="background:#707070;"|084.M31 |[[Jaghatai Khan]] disappears while fighting [[Dark Eldar]] on [[Corusil V]], near the [[Maelstrom]]. Presumably he pursued a Dark Eldar Lord through an alien portal that led into the dimension occupied by the Dark Eldar ([[Commoragh]]?). * ||-style="background:#707070;"|356-372.M31|[[Vindicator]] created during third [[Rothern I]] pacification of the Great Heresy.|WD231|-style="background:#707070;"|c 781.M31 |The first [[Black Crusade]]. The First Battle of [[Cadia]]. (|[[Codex: Chaos Space Marines 3]])|-style="background:#707070;"|893.M31|[[Scribe]] First Order [[Wendel Voss]] records the [[Cleansing of Laeran]] in which the alien [[Laer]] are wiped out by the [[Emperor's Children]] led by [[Fulgrim]].|WD255|}