|First Founding. The Emperor uses DNA samples from the Primarchs to create twenty Space Marine Legions.||Codex: Space Marines (3rd Edition) pg. 47|
|Grabya's Theorem demonstrates how Primarch genetic data could be used to stabilize genetic development of Space Marines. Sorian's Inductus Excelsus shows requirements for more warriors is vast. Accelerated gene-culturing techniques implemented, reducing processing time to create Space Marine to one year. However, accelerated gene-seed has unseen fundamental flaws.||Ibid.|
|ca. M30||The Emperor of Mankind orders the construction of the Astronomican, powered with his own psychic might.||Warhammer 40,000 6th Edition Rulebook pg. 168|
|ca. M30-M31||Eldar foreseeing the dark future for their race refit their starships into Craftworlds and leave the heart of their empire.||Codex: Dark Eldar (5th Edition) pg. 20|
|125.M30||The M35 source Grimoire Hereticus claims that the Luna Wolves are renamed the Sons of Horus at this time
(Horus Rising shows that Horus did not formally rename his legion until after fighting the Interex).
|Codex: Space Marines (3rd Edition) pg. 47; Codex: Dark Angels (4th Edition) pg. 73|
|350.M30||Karis Cephalon rediscovered during the Great Crusade.||White Dwarf 258 (US)/259 (UK), pg. 61|
|ca. 770.M30||Lorgar's six-year civil war/crusade ends with the unification of Colchis under his rulership.||The First Heretic Chapter Ten|
|809.M30||Warp-dilated horologs state that the Great Crusade begins around this time.
(Canon Conflict) Codex: Space Marines (3rd Edition) cites that the Great Crusade began in M29.
|Horus Rising Chapter One; Warhammer 40,000 6th Edition Rulebook pg. 168|
|ca. 815.M30||The Emperor arrives on Mars.||Mechanicum Chapter 1.03|
|852.M30||Pride of the Emperor's keel is laid down in the Jupiter shipyards.||Fulgrim Chapter Two|
|The Primarchs are rediscovered and united with their Legions. Hundreds of thousands of human worlds are reclaimed under the Pax Imperialis.||Warhammer 40,000 6th Edition Rulebook pg. 168|
|ca. 860.M30||The Emperor of Mankind comes to Colchis. Lorgar joins the Great Crusade.||The First Heretic Chapter Ten|
|908.M30||The Word Bearers bring Forty-Seven Ten (Khur) to compliance. They eventually turn the planetary capital Monarchia into a temple city dedicated to worship of the Emperor.||The First Heretic Chapter One|
|913.M30||Angron-Thal'kr disappears on the eve of the Battle of Desh'elika Ridge, teleported to the Emperor of Mankind's ship. Nucerian forces assume that he fled the field. Angron's fellow slave-gladiators are slaughtered.||Index Astartes: World Eaters; Betrayer Chapter Eighteen|
|952.M30||The 63rd Expeditionary Fleet brings 63-8 (Davin) to compliance. Eugen Temba is installed as Imperial governor. His ship Glory of Terra crashes on Davin's moon shortly after.||False Gods Chapter Three, Seven|
|The two unknown legions are removed from Imperial records and the Primarchs swear oaths to never speak of them again.||The First Heretic Chapter Ten|
|970.M30||On the order of the Emperor of Mankind, the Ultramarines destroy Monarchia with seven days' notice. Lorgar and the Word Bearers arrive two months later and the Emperor forces them to kneel before him and Roboute Guilliman in the ashes of the Perfect City and its slain inhabitants. Only seven survivors are found, including Cyrene Valantion.||The First Heretic Chapter Two - Four, Nine; Know No Fear|
|The Word Bearers bring Forty-Seven Sixteen to compliance by slaughtering every living inhabitant, approximately two hundred million, in one day.||The First Heretic Chapter Seven, Eight|
|973.M30||Lorgar takes his pilgrimage to the Eye of Terror and comes out a prophet of the Chaos gods.||The First Heretic Part Two; Aurelian Part Two|