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Year Event Source
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
540.M30 The Lucien Mechanicum founds an outpost on Mezoa. The Horus Heresy Book Four - Conquest pg. 66
ca. 570-750.M30 Rogue trader Lady Arica Orpheus explores the reaches of the Mandragoran Stars in the galactic southwest, cataloging countless aged stars and dead worlds. Records of her voyages mention pre-human ruins and monuments. Imperial Armour Volume Twelve - The Fall of Orpheus pg. 16
ca. 675.M30 The Massacre of Gaduare. Less than five thousand Thunder Warriors slaughter fifty thousand civilian militiamen in less than an hour on the hills of Gaduare in Franc. Tales of Heresy: The Last Church
ca. 745.M30 The Emperor of Mankind has the last church on Terra, the Church of the Lightning Stone, destroyed after speaking with the last priest. Ibid.
748.M30 The Invincible Reason begins her service in the Imperial fleet. Descent of Angels Chapter Eighteen
ca. 750.M30 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 craftworlds 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. Codex: Eldar (4th Edition) pgs. 4-5; Codex: Dark Eldar (5th Edition) pg. 20; The First Heretic Chapter Seventeen; The Horus Heresy Book Two - Massacre pg. 14
The Primarch Project. The Emperor of Mankind learns warpcraft from the Chaos gods and uses it and advanced Martian genetic engineering to create the primarchs 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. False Gods Chapter Fourteen; The First Heretic Chapter Seventeen
An Eldar craftworld crashes on Typhon Primaris. The jungle eventually claims it and it will be lost for ten thousand years. Warhammer 40,000: Dawn of War II - Retribution
ca. 780.M30 The Emperor's geneticists refine the creation of the gene-seed that will allow him to create the Space Marine Legions. The First Heretic Chapter Seventeen
First Founding. The Emperor uses DNA samples from the Primarchs to create twenty Space Marine Legions. 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. Codex: Space Marines (3rd Edition) pg. 47
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. The Horus Heresy Book One - Betrayal, pgs. 80-81
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; The Horus Heresy Book Two - Massacre pg. 14
ca. 790.M30 Incaladion's social order breaks down. The Preceptor-General is assassinated. As various factions of the Adeptus Mechanicus and xenos invaders battle over the forge world, the Legio Fureans is gradually whittled down. The Horus Heresy Book Three - Extermination pg. 155
798.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; Codex: Imperial Knights (6th Edition)
803.M30 Astartes of the XV Legion first begin to express psychic powers, followed shortly by the flesh-change. A Thousand Sons Chapter Twenty-Two
The rogue trader Hel DeAniasie catalogues the trinary Paramar system. The Horus Heresy Book Three - Extermination pg. 19
804.M30 The Nephritil and Ayurnas wipe out the Mohindas 11th. Mark of Calth: Unmarked
ca. 805.M30 The Emperor arrives on Mars. Mechanicum Chapter 1.03
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
The Emperor of Mankind comes to Cthonia and recruits Horus to lead the XVI Legion. The facts of the events are lost to the fog of the ages. Index Astartes: Black Legion; The Horus Heresy Book One - Betrayal pg. 67
806.M30 The Dark Eldar Kabal of the Shrieking Heart begins raiding Antimon around this time. Tales of Heresy: Wolf at the Door
The eleven star systems comprising the Osiris Cluster are brought to Compliance. The Horus Heresy Book Five - Tempest pg. 73
807.M30 The Battle of Rust. The 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. The Horus Heresy Book Two - Massacre pgs. 65-66
The Emperor comes to Fenris and recruits Leman Russ to lead the 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."

(Canon Conflict) False Gods Chapter Ten states that Horus fought alone with the Emperor for three decades after Horus was found

Index Astartes: Space Wolves; Codex: Space Wolves (5th Edition) pg. 9; Tales of Heresy: Wolf at the Door
ca. 810.M30 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 Horus Heresy Book Two - Massacre pg. 66
813.M30 Mezoa becomes a Forge World of the Adeptus Mechanicus. The Horus Heresy Book Four - Conquest pg. 66
824.M30 Rogue trader Vaspperly Elgin makes contact with the pre-industrial remnant human inhabitants of Lethe. Ibid. pg. 73
ca. 829.M30 The Proximan Betrayal. An insurrectionist cell attacks the compliance ceremony on Proxima. The Legio Custodes and Astartes of the XVI Cohort of the 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 Horus Heresy Book One - Betrayal pg. 103
ca. 830.M30 The III Legion's gene-seed reserves fail to arrive at the vaults on Luna and an artificial pathogen obliterates several gene-seed vaults on Terra, sealing the fate of the III Legion. Index Astartes: Emperor's Children; The Horus Heresy Book One - Betrayal pg. 104; The Horus Heresy Book Three - Extermination pg. 80
Anomalous Legiones Astartes activity is first reported. The actions of unidentified Astartes is attributed to a "Ghost Legion." The Horus Heresy Book Three - Extermination pg. 81
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 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
834.M30 The 12th Expeditionary Fleet returns to the Osiris Cluster with specialized reinforcements. The fleet discovers the worlds either littered with unburied dead or locked in civil war. The Osirian Psybrid xenoforms are nowhere to be found, though investigation uncovers the history of their insidious, covert infiltration of the cluster. Ibid.
835.M30 The Emperor comes to Inwit and recruits Rogal Dorn to lead the Imperial Fists. Dorn is the seventh lost son found. Index Astartes: Imperial Fists; The Lightning Tower; The Horus Heresy Book Three - Extermination pg. 60; Praetorian of Dorn Gift of the Father
The 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. Index Astartes: Emperor's Children; The Horus Heresy Book One - Betrayal pg. 104
Luther finds a feral child in the forests of Caliban and names him Lion El'Jonson (The Lion, Son of the Forest). Descent of Angels Prologue
Lion El'Jonson leads the knights of Caliban in a ten-year campaign to exterminate the great beasts that haunt the forests. The Knights of Lupus refuse to join the hunt and are destroyed. Descent of Angels Prologue, Book Two
ca. 840.M30 The Emperor comes to Macragge to meet Roboute Guilliman. Recognizing him as his son, the Emperor brings Guilliman to lead the XIII Legion. The Legion adopts the trappings of Guilliman's culture and becomes the Ultramarines. The Horus Heresy Book Five - Tempest pg. 75, 96
840.M30 Pride of the Emperor's keel is laid down in the Jupiter shipyards. Fulgrim Chapter Two
841.M30 House Vornherr's Warrant of Ancient Domain and Arms is ratified. The Horus Heresy Book Five - Tempest pg. 122
842-843.M30 The IV Legion expend nearly all of their front-line forces during the liberation of Incaladion. The Horus Heresy Book Three - Extermination pg. 102
843.M30 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. The Horus Heresy Book Six - Retribution pg. 60
Vulkan leads Nocturne's defenders against Eldar raiders. Index Astartes: Salamanders
ca. 848.M30 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. The Horus Heresy Book Three - Extermination pg. 109-110
ca. 850.M30 The Knight World Chrysis is rediscovered. Codex: Imperial Knights (6th Edition)
The Emperor comes to Caliban to recruit Lion El'Jonson to lead the First Legion. Zahariel El'Zurias narrowly averts an assassination attempt on the Emperor. The Lion dubs the First Legion the Dark Angels after figures of Caliban myth. Descent of Angels Book Three
856.M30 Lorgar's six-year civil war/crusade ends with the unification of Colchis under his rulership. The First Heretic Chapter Ten
857.M30 The Emperor of Mankind comes to Colchis and recruits Lorgar to lead the Imperial Heralds. Lorgar renames his legion the Word Bearers. Ibid.; Index Astartes: Word Bearers; Aurelian Prologue; The Horus Heresy Book Five - Tempest pg. 16
The 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. Index Astartes: Night Lords; Shadows of Treachery: Prince of Crows Chapter Six
ca. 860.M30 The Emperor comes to Chogoris and recruits Jaghatai Khan to lead the White Scars. Index Astartes: White Scars; Brotherhood of the Storm Part I
860.M30 The Ultramarines respond to a sighting of the Osirian Psybrid xenos only to find a dying agri-world. The Horus Heresy Book Five - Tempest pg. 96
865.M30 Orks invade Rennimar shortly after the Imperial Fists bring the world to Compliance. Praetorian of Dorn Lord of Conquest
869.M30 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 Imperial Truth: The Devine Adoratrice; Vengeful Spirit Chapter 2
876.M30 The 611th Expeditionary Fleet bloodlessly brings Zavarich to Compliance. The Horus Heresy Book Four - Conquest pg. 68
ca. 885.M30 The 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. Index Astartes: Death Guard; The Horus Heresy Book One - Betrayal pg. 122
ca. 890.M30 The Third Rangdan Xenocide. Some fifty thousand Space Marines fall in action, striking a severe blow to the manpower of the Dark Angels. The Alpha Legion unexpectedly appears as a reinforcing element. The Horus Heresy Book Three - Extermination pg. 82, The Horus Heresy Book Five - Tempest pg. 96
891.M30 The Crisis of the Hungering Gyre. The Horus Heresy Book Three - Extermination pg. 19
Rogue trader Corthona Van Der Veld discovers the dead world that she names Grail. The Horus Heresy Book Four - Conquest pg. 71
897.M30 Moab becomes an Imperial world upon installation of an Imperial governor. Ibid. pg. 67
Numinal is colonized to secure the Coronid Reach's transport and navigation channels. Ibid. pg. 75
899.M30 The War Hounds encounter the Osirian Psybrids while battling the Orks of the Glortian Empire near Eurydice Terminal. Roboute Guilliman receives astrotelepathic information and moves to reinforce the War Hounds and wipe out the Psybrids. The Horus Heresy Book Five - Tempest pg. 97
902.M30 The Iron Warriors 3rd and 118th Grand Battalions suffer 65% casualties in the subjugation of Kaldorax Aleph. The Horus Heresy Book Three - Extermination pg. 251
903.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
907.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 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. Index Astartes: World Eaters; Betrayer Chapter Eighteen; Tales of Heresy: After Desh'ea
921.M30 The Luna Wolves exterminate the keylekid xenos. Horus Rising Part One Chapter Nine
926.M30 Vlorlath Srader is established within the Manachean Commonwealth after the region's Compliance. The Horus Heresy Book Four - Conquest pg. 72
ca. 927.M30 The Cryptosi Purgation. The Horus Heresy Book Three - Extermination pg. 94
Mark II Legiones Astartes power armour is considered largely obsolete by this time. Ibid.
933.M30 The Iron Warriors 33rd Grand Battalion suffers 78% casualties during the Third Temporaferrox Extermination. Perturabo considers the losses acceptable in light of the complete annihilation of the xenos. The Horus Heresy Book Three - Extermination pg. 251
ca. 935.M30 The Emperor of Mankind discovers Magnus the Red on Prospero and unites him with the XV Legion. Magnus names them his Thousand Sons.

(Canon Conflict) Magnus appears in Lorgar's recollections in The First Heretic Chapter Five; Ahzek Ahriman names Corvus Corax among the primarchs who feared the pre-Magnus Thousand Sons' psychic powers in A Thousand Sons Chapter Twenty-Two

A Thousand Sons Chapter One
942.M30 Gethsamaine is colonized. The Horus Heresy Book Four - Conquest pg. 67
945.M30 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. Horus Rising Part Two Chapter Three; False Gods Part One Chapter One, Three, Seven
The 4th Expeditionary Fleet discovers Sarosh. Harlad Furst is appointed Imperial governor, but the planet's impenetrable bureaucracy prevents any action toward Compliance for over a year. The Saroshi try to destroy Invincible Reason with an atomic bomb, but are defeated. Descent of Angels Book Four
948.M30 Luther and five hundred Dark Angels battle-brothers are sent back to Caliban to train new recruits. Fallen Angels Prologue
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
The Emperor of Mankind comes to Kiavahr's moon Lycaeus as its slave labourers seize control. He recruits the uprising's leader, Corvus Corax, to lead the Raven Guard. Index Astartes: Raven Guard; Deliverance Lost Chapter Nine
962.M30 The Iron Warriors 282nd Grand Battalion suffers 32% casualties during the Pacification of the Saryine Compact while reducing the rebels' combat strength to 30%. Perturabo censures the 282nd's command for "lack of zeal." The Horus Heresy Book Three - Extermination pg. 251
964.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 Horus Heresy Book Two - Massacre pg. 19
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; Tales of Heresy: Scions of the Storm
965.M30 The Space Wolves participate in a classified action. The Horus Heresy Book Two - Massacre pg. 19
966.M30 Cadia is entered into the Carta Imperialis. Ibid.
967.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
969.M30 The Space Wolves participate in a classified action. The Horus Heresy Book Two - Massacre pg. 19
970.M30 Horus, Calas Typhon, and Luther lead the 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. Angels of Caliban Prologue
972.M30 The Night Lords and Raven Guard participate in the Farinatus Extermination. The Horus Heresy Book Two - Massacre pg. 19
late 970s.M30 The Night Lords engage in a protracted persecution of the Gethora Warp-Witches across the Vaomir Reaches. The Horus Heresy Book Five - Tempest pg. 139
976.M30 Dwell is brought to Compliance. Age of Darkness: Little Horus
A Luna Wolves fleet led by Horus responds to a distress call from a scout ship lured into a minefield. Horus discovers that the attackers have boarded the ship and comes face to face with the intruders' leader: the last Primarch Alpharius. Alpharius remains at Horus's side for several months before journeying to Terra and meeting the Emperor of Mankind.

(Canon Conflict) The Horus Heresy Book Three - Extermination pg. 86 claims that this account is false.

Index Astartes: Alpha Legion
981.M30 The Luna Wolves exterminate the artificially-intelligent overseers of Dahinta. Horus Rising Part One Chapter Nine
Alpharius assumes command of the Alpha Legion. The Horus Heresy Book Two - Massacre pg. 19
The Iron Warriors 3rd, 14th, and 72nd Grand Battalions suffer 42% overall casualties during the Burning of the Pharun Drift. The 3rd suffers 80% casualties, but Perturabo deems it acceptable losses for the complete depopulation of the target worlds. The Horus Heresy Book Three - Extermination pg. 251
984.M30 Rogal Dorn objects to Konrad Curze and the Night Lords' brutal pacification of Cheraut. Curze nearly kills Dorn and is taken into custody, which he soon escapes, slaughtering the Imperial Fists and Emperor's Children guarding him. Curze then leads the Night Lords fleet to destroy Nostramo.

(Canon Conflict) The Index Astartes article puts the Cheraut incident in 7232826.M29.

The Horus Heresy Book Two - Massacre pg. 19, 98; Index Astartes: Night Lords; The Dark King
986.M30 The Alpha Legion is assigned to exterminate the Ak'Haireth from Segmentum Solar The Horus Heresy Book Three - Extermination pg. 102
989.M30 Alpha Legion apothecaries design a virus to exterminate the Ak'Haireth and infect the human populations of the worlds upon which they prey. The Ak'Haireth eventually starve to extinction. Ibid. pgs. 102-103
The Raven Guard exterminate the Khrave occupying Indra-sûl. Ibid. pg. 152
ca. 992.M30 The Luna Wolves find a complete and detailed map of ancient Terra in a bunker buried ten kilometres beneath a dead world. Horus Rising Part One Chapter Nine; False Gods Chapter Thirteen
994.M30 The Raven Guard eliminates Isstvan III's planetary governance overnight. Major Vardus Praal of the XIth Lastrian Rifles is appointed Imperial governor. Galaxy in Flames Chapter Three; Flight of the Eisenstein Chapter Four; Deliverance Lost Chapter One; The Horus Heresy Book One - Betrayal pgs. 38-39; The Horus Heresy Book Two - Massacre pg. 19
997.M30 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. Tales of Heresy: Wolf at the Door
998.M30 The Imperial military fights the orks of Charhack for the Pargor Hith system. The Horus Heresy Book One - Betrayal pg. 40
999.M30 The 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 Prologue
The Ullanor Crusade. The Emperor of Mankind leads the Luna Wolves, Ultramarines, and millions of Imperial Army elements against the ork warboss Urlakk Urg's empire in the Ullanor sector. A Thousand Sons Chapter One
The Thousand Sons bring Twenty-Eight Sixteen (Aghoru) to Compliance in a three-month endeavour. A Thousand Sons Book One
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 Titans are left behind in the emergency evacuation. Legion Part One, Part Two Chapter One
Earliest estimated timeframe in which Imperial governor Vardus Praal of Isstvan III forsakes his oath to the Imperium. The Horus Heresy Book One - Betrayal pg. 40

M29 Timeline M31