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year	events	source
	Grimoire Hereticus written - list with information on the Space Marine Legions which turned during the Horus Heresy.	Codex: Space Marines (4th Edition)
	Battle of the Broadsword. Tallarn Desert Raiders suppress Chaemos Rebellion.
	Tiamet solar system discovered. On every ecosystem extremely aggressive life-forms fight each other. They unite against the human expedition whose members are forced to quarantine themselves on Tiamat reporting for another 162 hours before finally succumbing. Xenobiologists of the late 41 millennium theorize that Tyranid seeds managed to reach this system by unknown means.	Codex: Tyranids (4th Edition) page 24 forgotten fleets
	Forge World of Tigrus overrun by the Ork Warlord Arrgard the Defiler, destroying the original designs for the Vanquisher.	Imperial Armour Volume One - Imperial Guard and Imperial Navy
Early M35	Ecclesiarchy's power wanes.	Codex: Sisters of Battle (2nd Edition)
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
~200.M35	Ecclesiarchy under Benedin IV moves to Ophelia VII and grows in power.	Codex: Sisters of Battle (2nd Edition)
344.M35	Initial Imperial surveys of Tomb complexes on Angelis (Gorkamorka) Later in M35, Ork Space Hulk crashlands 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.
~500.M35	Greigor XI becomes Ecclesiarch, declares Ecclesiarchy will return to Terra.	Codex: Sisters of Battle (2nd Edition)
359.M35	Imperial Explorators gain access to deserted Necrontyr tombs on Angelis.
598.M35	Executioners and Mantis Warriors Space Marine chapters are founded.
762-765.M35	Tallarn scout squad Lurenz's Gravediggers harass Eldar forces on Holon Prime.
789.M35	The primitive Tau are discovered by the Adeptus Mechanicus Vessel Land Vision.	Codex: Tau Empire (4th Edition)
843.M35	Distress call from Grendel's World investigated. Planet discovered to have been attacked and all inhabitants slain by terror tactics of the Night Lords.
975.M35	The Cataclysm of Souls: The Ecclesiarchy begin to rebind the sundered Imperium as a religious state, entering into wars of faith with the forces of Nova Terra.	Warhammer 40,000 5th Edition Rulebook

M34	Timeline	M36