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year events source
The Grimoire Hereticus, a list with information on the Space Marine Legions which turned during the Horus Heresy, is written. Codex: Space Marines (4th Edition)[Needs Citation]
An Explorator Fleet out of Triplex Phall discovers the Tiamet System. All seven planets support life that is aggressively carnivorous, hostile to human explorers, and appears to share a single intelligence. The explorators are forced to quarantine themselves to prevent Tiamet's lifeforms from leaving the system, transmitting data for one hundred sixty-two hours before succumbing to Tiamet's ecosystem. Codex: Tyranids (4th Edition) pg. 24
The Ork Warlord Arrgard the Defiler overruns the Tigrus Forge World, destroying the original designs for the Leman Russ Vanquisher. Imperial Armour Volume One - Imperial Guard and Imperial Navy[Needs Citation]
Early M35 Ecclesiarchy's power wanes. Codex: Sisters of Battle (2nd Edition)[Needs Citation]
Early M35 Nova Terra Interregnum: The Ur-Council of Nova Terra denounce the High Lords of Terra and secede from the Imperium, taking the entire Segmentum Pacificus with them. For 900 years, the Imperium is a bisected empire. Warhammer 40,000 5th Edition Rulebook pg. 124
The Moirae Schism, concurrent with the Nova Terra Interregnum, splits the Adeptus Mechanicus and closely-associated Titan Legions and Space Marine Chapters. The Raukaan Clan of the Iron Hands remains unified in doctrine. The Martian fleet destroys Moirae forge world to purge its heretical doctrines, which will take over two thousand years to complete. Warhammer 40,000 6th Edition Rulebook pg. 170; Imperial Armour Volume Ten - The Badab War - Part Two pg. 96; Clan Raukaan - A Codex: Space Marines Supplement (6th Edition)
104.M35 The Dark Angels dispatch the Ravenwing to Nova Terra to follow a lead on The Fallen, but return without prisoners. Codex: Dark Angels (6th Edition) pg. 23
173.M35 Achernar Invasion - The Blood Angels 3rd Company is reassigned to counter Orkish raids in the Achernar system, perilously close to Holy Terra. The Sons of Sanguinius wipe them out so effectively that no Orks will be seen within a dozen light years of Achernar for millennia. Imperial Armour Volume Two - Second Edition: War Machines of the Adeptus Astartes pg. 17
~200.M35 Benedin IV orders the Holy Synod moved from Terra to Ophelia VII. Separated from the Senatorum Imperialis by ten thousand light years, the Ecclesiarchy's power increases, forming the Frateris Templar forces that rival the size of the Imperial Guard. Codex: Sisters of Battle (2nd Edition)[Needs Citation]; Dark Heresy: Blood of Martyrs pg. 9
Early M35 The Icaria Crusade. Near the end of the thirty-year campaign, a Frateris Templar force secures an ancient factory on Fornoth and discovers a Dark Age of Technology database. The only new design culled from the factory concerned a half-designed flamethrower tank. The data is combined with Imperial technology to produce the Immolator for the Adepta Sororitas. Codex: Sisters of Battle (2nd Edition) pg. 46
344.M35 Initial Imperial surveys of tomb complexes on Angelis (Gorkamorka). Later in M35, an Ork Space Hulk crash lands on Angelis, burying the humans alive around the temples. The survivors descend into savagery, becoming the Diggas. Necrons possibly ally with some members of the Diggas to subjugate the other tribes and repulse the Orks. [Needs Citation]
359.M35 Imperial Explorators gain access to deserted Necrontyr tombs on Angelis. [Needs Citation]
400.M35 The Blood Angels, Astra Militarum, and Imperial Knights of House Griffith defeat Waaagh! Starsmasha in the Redhaven System. Codex: Blood Angels (7th Edition) A Chronicle of Heroes
495.M35 The Deathwing deploys in its entirety to capture Obidiah Hrakon, supporter of Nova Terra and a Fallen Angel. Codex: Dark Angels (6th Edition) pg. 23
~500.M35 Greigor XI becomes Ecclesiarch and declares that the Ecclesiarchy will return to Terra. The cardinals oppose his proposition, citing the institution's heavily-entrenched position on Ophelia VII. Tithes are increased in order to finance the decade-long relocation to and improvement of the Ecclesiarchy's palaces on Terra. Codex: Sisters of Battle (2nd Edition)[Needs Citation]; Dark Heresy: Blood of Martyrs pg. 9
700.M35 Five companies of the Black Wings Chapter turn on their brothers at the height of their centennial Ritual of Remembrance. Hundreds are slain, several strike cruisers are destroyed, and much of the fortress-monastery is destroyed before the renegades are driven off. The Chapter halves its crimson armour with black until they can hunt down their renegade brethren. Imperial Armour Volume Two - Second Edition: War Machines of the Adeptus Astartes pg. 17
762-765.M35 Tallarn scout squad Lurenz's Gravediggers harass Eldar forces on Holon Prime. [Needs Citation]
789.M35 The Adeptus Mechanicus explorator vessel Land's Vision discovers T'au and its Stone Age inhabitants. Subsequent Warp storms prevent all Imperial colonization attempts. Codex: Tau (3rd Edition) pg. 4; Codex: Tau Empire (4th Edition) pg. 4
831.M35 The Barbarus Incursion - Black Templars fought with Daemons. Late all records of this Incursion were expunged. Imperial Armour Volume Two - Second Edition: War Machines of the Adeptus Astartes pg. 17;
Imperial Armour Volume Two - Space Marines and Forces of the Inquisition, pg. 75
867.M35 Daemons infiltrate the Eldar Exodite world of Menimshemash through its "world spirit" and burn it with the fires of change. Codex: Chaos Daemons (6th Edition) pg. 21
973.M35 The Decimator daemon engine is first recorded in Imperial space during the Grief of Herodin. The machine is traced back to the works of the heretical Sepketraal cult, thought destroyed in the Scouring. Imperial Armour Volume Thirteen - War Machines of the Lost and the Damned pgs. 22, 126
975.M35 The Cataclysm of Souls: the Ecclesiarchy begins to rebuild the sundered Imperium as a religious state, entering into wars of faith with the forces of Nova Terra. The Dark Angels take part in order to pursue the Fallen. Warhammer 40,000 5th Edition Rulebook pg. 125; Codex: Dark Angels (6th Edition) pg. 23
977.M35 The Ultramarines battle barge Excelsior fails to rematerialize following failure of its Gellar field in Warp-transit. Codex: Chaos Daemons (6th Edition) pg. 21
980.M35 The Dark Angels abandon their mission to cleanse Imperial space of Hrud infestation. The Chapter Master of the Ultramarines files a complaint with the High Lords of Terra, but action is never taken. Codex: Dark Angels (6th Edition) pg. 23
991.M35 The 21st Founding. Most, if not all, the Space Marine Chapters established in this Founding suffer catastrophic misfortunes. The Grey Knights are called to expunge the failures of the Cursed Founding. Warhammer 40,000 6th Edition Rulebook pg. 170

M34 Timeline M36