44
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M30
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|Eight full Legions are deployed in a campaign to destroy the artificial world of Sedna in the Solar system and the [[xenos]] species controlling it. After the campaign, Sedna falls silent and the Imperium forgets about it.
|[[The Horus Heresy Book Eight - Malevolence]] pg. 12
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|800.M30
| The [[Molorian Revolt]]
|[[The Horus Heresy Book Seven - Inferno]] pg. 92
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|804.M30
|[[Mezoa]] becomes a [[Forge World]] of the [[Adeptus Mechanicus]].
|[[The Horus Heresy Book Four - Conquest]] pg. 66
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|823.M30
|The [[Incident of Bezant]] and the [[Bezantine Oath]] - First case of the [[Flesh Change]] within the [[Thousand Sons]] Legion.
|[[The Horus Heresy Book Seven - Inferno]] pg.11
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|824.M30
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|833.M30
|The [[Osiris Rebellion]]. The eleven star systems of the Osiris Cluster declare independence from the [[Imperium of Man]]. Gren Vosotho, Legion Commander of the [[Ultramarines|XIII Legion]], sends the 12th Expeditionary Fleet to end the rebellion. Failures of intelligence turn what was intended to be a swift decapitation strike into a battle of attrition against a previously-unknown [[xenos]] breed that drives the civilians to attack the Legiones Astartes in droves. The strike force withdraws, suffering serious losses, including Commander Vosotho and the Legion's flagship ''Sethaln's Thunder''. Command falls to [[Marius Gage]]. The Osiris Cluster is blockaded.
|[[The Horus Heresy Book Five - Tempest]] pg. 73
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|[[The Horus Heresy Book One - Betrayal]] pg. 40 <!-- "almost a decade previously" to Isstvan III -->
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|rowspan=68|999.M30
|The [[Black Legion|Luna Wolves]] and [[Blood Angels]] exterminate the [[nephilim]] on [[Melchior]]. The Luna Wolves proceed to the Ullanor sector while the Blood Angels go to Perseus Null.
|[[Fear to Tread (Novel)|Fear to Tread]] Prologue
|The [[Hrud]] cripple the 51st Expeditionary Fleet in an Imperial effort to purge them from the Sak'trada Deeps.
|[[Perturabo: The Hammer of Olympia (Novel)|Perturabo: The Hammer of Olympia]]
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|The [[Pacification of the Ark Reach Cluster]]
|[[The Horus Heresy Book Seven - Inferno]] pg.10
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|The [[Xantriss Insurrection]]
|[[The Horus Heresy Book Seven - Inferno]] pg.93
|}