Changes

|The [[Massacre of Gaduare. ]] - Less than five thousand [[Thunder Warrior]]s slaughter fifty thousand civilian militiamen in less than an hour on the hills of Gaduare in Franc.

|[[The Last church of Terra]] - The [[Emperor of Mankind]] has the last church on Terra, the Church of the Lightning Stone, destroyed after speaking with the last priest.

|[[Fall of the Eldar]]. - The [[Eye of Terror]] erupts in the heart of the [[eldar]] empire as [[Slaanesh]] is born. She Who Thirsts tears billion of eldar souls from their bodies. Only the [[Exodite]] and [[craftworld]]s far from the empire and [[webway]] domains such as [[Commoragh]] survive. The eruption of psychic energy blows away the warp storms that had made interstellar travel impossible for thousands of years.

|The [[Primarch Project]]. - The [[Emperor of Mankind]] combines advanced Martian genetic engineering with the warpcraft he learned from the [[Chaos]] Gods to create the [[primarch]]s and the [[gene-seed]] prototypes. The Chaos Gods steal the gestating primarchs from the Emperor's laboratory deep beneath [[Terra]] and scatter them across the galaxy.

|'''Creation of the gene-seed''' - The Emperor's geneticists refine the creation of the [[gene-seed]] that will allow him to create the [[Space Marine]] Legions.

|'''First [[Founding]]'''. - The Emperor uses DNA samples from the Primarchs to create twenty [[Space Marine Legion]]s. [[Grabya's Theorem]] demonstrates how [[Primarch]] genetic data could be used to stabilize genetic development of [[Space Marine]]s. [[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.

|'''Construction of the Astronomican''' - The [[Emperor of Mankind]] orders the construction of the [[Astronomican]], powered with his own psychic might.

|[[First Pacification of Luna]]. - VII, XIII, and XVI Legions annihilate the leadership of the Selenar gene-cults of [[Luna]] in six hours. The remaining cult leaders implore the Emperor to "call off [his] wolves" as they surrender. Evidence of occultism within the gene-cults is sequestered in the Imperial Dungeon.

|[[Vhnori Resurgence]] - The Crimson Walkers emerge in the Panpacific Enclaves of [[Terra]], using psychic powers to dominate minds and animate constructs made of dead flesh. The [[Night Lords|VIII Legion]] brutally crushes the Walkers in a campaign of terror.|[[The Horus Heresy Book Eight - Malevolence]] pg. 12|-||[[Sedna Campaign]] ([[Liberation of the Sol System]]) - 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.

|800.M30|[[Molorian Revolt]] |[[The Horus Heresy Book Seven - Inferno]] pg. 92|-|rowspan=32|803.M30

|'''Discovery of the Paramar system''' - The [[rogue trader]] [[Hel DeAniasie]] catalogues the trinary [[Paramar system]].

|The [[Battle of Rust]]. - The [[Iron Hands|Xth Legion]] destroys the Krooked-Klaw [[ork]] empire, centred on 02-34 ("Rust"), with tactics known as the "Hammer and Storm." The Urshan Velites coin the name "Storm Walkers" for the Legion.

|[[Siege of Reillis]] - <!-- At this time the Emperor have rediscovered only Horus-->| [[Index Astartes IV]] — ''Sons of Horus''|-||'''Recruitment of Leman Russ''' - The Emperor comes to [[Fenris]] and recruits [[Leman Russ (Primarch)|Leman Russ]] to lead the [[Space Wolves|VI Legion]]. Russ's sword-brothers insist on being initiated into the legion despite their advanced ages. Of hundreds of candidates, only a few score survive to become the Thirteenth Great Company "Greybeards."

|'''Recruitment of Ferrus Manus''' - The [[Emperor of Mankind]] comes to [[Medusa]] and recruits [[Ferrus Manus]] to lead the Xth Legion. Manus remakes the Legion in his image, naming them the [[Iron Hands]].

|The [[Incident of Bezant]] and the /[[Bezantine Oath]] - First case of the [[Flesh Change]] within the [[Thousand Sons]] Legion.

|The [[Proximan Betrayal. ]] - An insurrectionist cell attacks the compliance ceremony on Proxima. The [[Adeptus Custodes|Legio Custodes]] and Astartes of the XVI Cohort of the [[Emperor's Children|III Legion]] defend the [[Emperor of Mankind]], giving their lives so he can get to safety. In recognition of their sacrifice, the Emperor grants the III Legion the right to bear the Palatine [[Aquila]] in their heraldry and the right to invoke [[Exterminatus]] on Proxima.

|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.

|'''Recruitment of Rogal Dorn''' - The [[Emperor of Mankind|Emperor]] comes to [[Inwit]] and recruits [[Rogal Dorn]] to lead the [[Imperial Fists]]. Dorn is the seventh lost son found.

|'''Recruitment of Fulgrim''' - The [[Emperor of Mankind|Emperor]] comes to [[Chemos]] and recruits [[Fulgrim]] to lead the III Legion. After Fulgrim addresses the two hundred surviving Astartes, the Emperor accepts the name he had given them, the [[Emperor's Children]].

|'''Recruitment of Roboute Guilliman''' - The [[Emperor]] comes to [[Macragge]] to meet [[Roboute Guilliman]]. Recognizing him as [[Primarch|his son]], the Emperor brings Guilliman to lead the XIII Legion. The Legion adopts the trappings of Guilliman's culture and becomes the [[Ultramarines]].

|'''Recruitment of Magnus the Red''' - The [[Emperor of Mankind]] discovers [[Magnus]] the Red on [[Prospero]] and unites him with the XV Legion. Magnus names them his [[Thousand Sons]]. <!-- 13 years before Morningstar -->

|'''Discovery of Xana''' - [[Rogue trader]] Casilida DeAniasie makes contact with the Sovereign Forge Domain of [[Xana]], leading to diplomatic negotiations between Xana, the [[Imperium of Man]], and the [[Adeptus Mechanicus]].

|'''Recruitment of Sanguinius''' - The Emperor comes to [[Baal]] to recruit [[Sanguinius]]. The [[Blood Angels|IX Legion]] are ordered to muster at the Teghar system to meet their [[Primarch]], a process that takes two years and four months.

|[[Teghar Campaign]] - The IX Legion brings the Teghar system to Compliance. [[Sanguinius]] renames his legion the [[Blood Angels]].

|'''Recruitment of Perturabo''' - The [[Emperor]] comes to [[Olympia]] and recruits [[Perturabo]] to lead the IV Legion. He finds his forces lacking and decimates them, ordering nine of every ten Legionaries to kill the remaining with their bare hands. He takes the rest on a campaign to subjugate the [[Meratara Cluster]]; at the end of the campaign, the IV Legion becomes the [[Iron Warriors]].

|'''Discovery of Chrysis''' - The [[Knight World]] [[Chrysis]] is rediscovered. [[House Krast]] of this planet joined to [[Imperium]]

|'''Recruitment of Lorgar''' - The [[Emperor of Mankind]] comes to [[Colchis]] and recruits [[Lorgar]] to lead the Imperial Heralds. Lorgar renames his legion the [[Word Bearers]].

|[[Purging of Arachiana]] - [[Lorgar]] leads the [[Word Bearers]] to destroy the Cult of the Iconoclast on the planet [[Arachnia]]. The sect worships "The One True God," who is described in ways similar to the Emperor. Lorgar incorporates elements of the Cult's dogma into early versions of the [[Book of Lorgar]].

|'''Recruitment of Konrad Curze''' - The [[Emperor of Mankind|Emperor]], [[Lorgar]], [[Ferrus Manus]], [[Rogal Dorn]], [[Fulgrim]], and representatives of their legions and the [[Ultramarines]] come to [[Nostramo]] and recruit [[Konrad Curze]] to lead the [[Night Lords]] Legion.

|'''Recruitment of Jaghatai Khan''' - The [[Emperor of Mankind|Emperor]] comes to [[Chogoris]] and recruits [[Jaghatai Khan]] to lead the [[White Scars]]. The Khan is the fifteenth [[Primarch]] rediscovered.

|[[Compliance of Riobhia]] - The [[Raven Guard|XIX Legion]] is tasked with forcing Compliance on [[Riobhia]] and destroying the Grael Library, a repository of proscribed knowledge. While en route, the Legion receives communication from a [[Thousand Sons]] fleet that had already intervened and dealt with the situation.

|[[Compliance of Molech]] - In the presence of the [[Emperor]], [[Horus]], [[Fulgrim]], [[Lion El'Jonson]], and [[Jaghatai Khan]], the [[Knight World]] [[Molech]] is brought to Compliance. Cyprian Devine of [[House Devine]] is named [[Planetary Governor]]. The Emperor garrisons Molech with almost a hundred Imperial Army regiments, three [[Adeptus Titanicus]] cohorts, and detachments from two legions to protect a secret that he suppresses in the memories of his sons.

|The [[Dulan Campaign]] ends. - The [[Dark Angels]] and [[Space Wolves]] come to blows during the void battle over Dulan, beginning a tradition of honour duels between the two Legions and later Chapters.

|[[Compliance of Zavarich]] - The 611th Expeditionary Fleet bloodlessly brings [[Zavarich]] to Compliance.

|'''Recruitment of Mortarion''' - The [[Emperor of Mankind|Emperor]] comes to [[Barbarus]] and recruits [[Mortarion]] to lead the Dusk Raiders. In his address to the assembled Astartes, Mortarion names him his [[Death Guard]].

|The [[Third Rangdan Xenocide]]. Some fifty thousand [[Space Marine]]s fall in action, striking a severe blow to the manpower of the [[Dark Angels]]. The [[Alpha Legion]] unexpectedly appears as a reinforcing element.

|The [[Crisis of the Hungering Gyre]].

|'''Discovery of Grail''' - [[Rogue trader]] Corthona Van Der Veld discovers the dead world that she names [[Grail]].

|'''Recruitment of Angron''' - [[Angron]]-Thal'kr disappears on the eve of the Battle of Desh'elika Ridge, teleported to the [[Emperor of Mankind]]'s ship. [[Nuceria]]n forces assume that he fled the field and Angron's fellow slave-gladiators are slaughtered. He kills every War Hounds officer who meets with him in the depths of the ''Adamant Resolve'' until [[Khârn]] convinces him that they are to serve him. Angron declares that the War Hounds will now be called his [[World Eaters]]. The flagship would later be renamed ''[[Conqueror (Ship)|Conqueror]]''.

|[[Battle of Keylek]] - The [[Black Legion|Luna Wolves]] [[Battle of Keylek|exterminate]] the [[keylekid]] [[xenos]].

|The [[Cryptosi Purgation]].

|[[Compliance of Davin]] - The [[63rd Expeditionary Fleet]] brings 63-8 ([[Davin]]) to Compliance. [[Kor Phaeron]] of the [[Word Bearers]] remains behind to enlighten the Davinites. [[Eugen Temba]] is installed as [[Imperial governor]]. His ship ''[[Glory of Terra]]'' crashes on Davin's moon shortly after.

|'''Recruitment of Corvus Corax''' - The [[Emperor of Mankind]] comes to Kiavahr's moon [[Deliverance|Lycaeus]] as its slave labourers seize control. He recruits the uprising's leader, [[Corvus Corax]], to lead the [[Raven Guard]].

|[[Pacification of the Saryine Compact]] - The [[Iron Warriors]] 282nd Grand Battalion suffers 32% casualties during the [[Pacification of the Saryine Compact]] conflict while reducing the rebels' combat strength to 30%. [[Perturabo]] censures the 282nd's command for "lack of zeal."

|[[Battle of 47-16]] - The [[Word Bearers]] bring Forty-Seven Sixteen to Compliance by slaughtering every living inhabitant, approximately two hundred million, in one day.

|'''Discovery of Cadia''' - [[Cadia]] is entered into the Carta Imperialis.

|[[Zaramund Campaign]] - [[Horus]], [[Typhus|Calas Typhon]], and [[Luther]] lead the [[Black Legion|Luna Wolves]], [[Death Guard]], and [[Dark Angels]] to suppress a rebellion on [[Zaramund]]. In the victory celebration, [[Lion El'Jonson]] arrives to rebuke [[Luther]] for disobeying his order to remain on [[Caliban]].

|[[Compliance of Isstvan III]] - The [[Raven Guard]] eliminates [[Isstvan III]]'s planetary governance overnight. Major [[Vardus Praal]] of the XIth Lastrian Rifles is appointed [[Imperial governor]].

|[[Battle of Kernunnos]] - The Tyrants of [[Kernunnos]] refuse to join the [[Imperium]]. [[Wolf Lord]] Bulveye of the Thirteenth Great Company of the [[Space Wolves]] swears that he will see them deposed.

|rowspan=89|999.M30|[[Melchior Compliance]] - 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.

|The [[Ullanor Crusade]]. The [[Emperor of Mankind]] leads the [[Black Legion|Luna Wolves]], [[Ultramarines]], and millions of Imperial Army elements against the [[ork]] [[warboss]] [[Urlakk Urg]]'s empire in the Ullanor sector.

|[[Battle of the Mountain]] - The [[Thousand Sons]] bring Twenty-Eight Sixteen ([[Aghoru]]) to Compliance in a three-month endeavour.

|[[Nurthene War]] - The [[Alpha Legion]] responds to the 670th Expeditionary Fleet's request for aid in the [[Nurth]] campaign. The planet is lost when the Nurthene activate a [[Black Cube]]. Half the Imperial Army forces and six [[Titan]]s are left behind in the emergency evacuation.

|[[Sak'trada Deeps Campaign]] - The [[Hrud]] cripple the 51st Expeditionary Fleet in an Imperial effort to purge them from the Sak'trada Deeps.