There is a lack of clarity over whether 000.M31 or 001.M31 is the first year of the millennium, and whether 999.M31 or 000.M31 is the last year of the millennium. Most sources state that 001.M31 is the first year and 000.M31 the last year. Since the creation of these articles Lexicanum has worked off of what is stated in the 5th Edition Rulebook, that being that 000.M31 is the first year, and 999.M31 is the last. Events in 000.M31 thus may have been either at the start or end of the millennium. For more information see here.
The mighty city of Commorragh grows strong upon the carrion of the old Eldar Empire. Despite the aching void that now blights their souls caused by the catastrophic birth of Slaanesh, the multi-dimensional metropolis grows in influence and power at an exponential rate, subsuming many lesser port-cities. The architects of the Eldar's Fall and the true, hidden masters of the Dark City, the Haemonculus Covens, withdraw to haunt the lower levels of the city's underspires.[99]
Perturabo leads the Iron Warriors to Olympia in response to civil unrest. The Legion kills over five million people and enslaves millions more to pacify the planet.[2a]
Council of Nikaea - An importance conclave is convened on Nikaea to determine the fate of Space MarineLibrarians. The Emperor concludes that all Librarians must return to their Battle Companies and cease using their psychic powers. Magnus the Red is ordered to cease his study of sorcery.[1c][3a][9]
The Interex makes contact with the Imperium in orbit of Murder. When the Hall of Devices in Xenobia Principis is burgled and destroyed, the Interex accuses the Imperial party of the crime.[11b]
The Fall of Horus - Erebus enters Horus' Warp vision disguised as Hastur Sejanus and tempts him with the powers of Chaos while Magnus the Red tries to dissuade him. Horus accepts the offer and awakens nine days after being interred in the Serpent Lodge's Delphos chamber. Magnus attempts to warn the Emperor of Horus' betrayal through forbidden sorcery, damaging the Golden Throne and psychic infrastructure on Terra in the process.[1d][12b]
Battle of Isstvan III - Horus uses the rebellion of Vardus Praal as a cover to purge the Legions under his command from all suspected loyalists. He deploys them on Isstvan III and then virus-bombs the planet from high orbit. Saul Tarvitz learns of the attack and warns the troops on the ground; Horus seizes the opportunity to blood his forces and directs a ground assault against the surviving loyalists. Nathaniel Garro kills Ignatius Grulgor to stop the cruiser Eisenstein from joining the attack and commandeers the ship to flee the system.[3a][18x]
The Word Bearers abandon a nearly-complete compliance action on 1301-20 (Calis) to respond to the Emperor's order to join the fleet approaching Isstvan V.[35a]
Bequa Kynska's Maraviglia premieres in La Fenice onboard the Pride of the Emperor. Singer Coraline Aseneca and her chorus transform into daemonettes while the music pushes the mortal audience into an orgiastic frenzy.[6e]
Imperial Fists Captain Yonnad is selected to lead his Legion's Retribution Fleet, consisting of three hundred Companies of Astartes and five hundred and sixty one ships, when Sigismund defers to remain at his Primarch's side. The fleet flies straight into a Warp storm that obliterates many ships, leaving Alexis Polux in command of the surviving fleet as it comes to rest in the Phall system.(170.006.M31)[34]
Ad Temperesta translates into realspace at the edge of the Isstvan system to covertly survey the planets. It transmits its findings back to the execution fleet. (528.006.M31)[3b]
The loyalist execution fleet translates into realspace in the Isstvan system and makes full speed toward Isstvan V. (565.006.M31)[12j]
The First Wave on Isstvan V (566.006.M31) - The first wave of loyalists make planetfall on Isstvan V. Contact is made with the traitors forty minutes later. After forty more minutes, the traitors begin their counter-attack. Ninety-six minutes after planetfall, traitor suicide attackers ambush the second landing wave. The fighting grinds to a stalemate two hours after planetfall and both sides withdraw after the third. Half an hour later, the second wave of Legion reinforcements begins planetfall.[12k]
Drop Site Massacre (567.006.M31) - The four reinforcing Legions open fire on the first wave, trapping them in a pincer. Fulgrim kills Ferrus Manus, signalling Angron and Mortarion to lead their Legions to attack. Corvus Corax, wounded after battling Lorgar and Konrad Curze, leads the few surviving loyalists in a break out of the Urgall Depression. Vulkan is missing in action. About half of the Imperial military defects to Horus' side.[6f][12i][35b]
Fulgrim defies Horus' order to travel to Mars in order to pillage a Mechanicum resource world. His subordinates determine that he is not himself and attempt to torture the daemon out of him.[38]
The wards that held the psychic wave caused by Magnus' intrusion into the Imperial Dungeon finally fail, releasing it to wash across the minds of Terra. Compounded with public knowledge of the events at Isstvan V, millions are driven insane or killed outright. The imprisoned Crusader Host breaks out of Khangba Marwu. Severian is the only Crusader not killed or recaptured; he is eventually tracked down and recruited by the Sigilite for his Knights-Errant.[21x][41]
Evacuation of Corvus Corax (835.006.M31) - Corvus Corax boards a shuttle to evacuate from Isstvan V after ninety-eight days of gruelling guerrilla warfare. Alpha Legion operatives infiltrate the Raven Guard while others prevent a World Eaters vessel from firing on the Raven Guard relief vessels.[42a][44][45]
Battle of Dominica Minor (4.392.007.M31) - Half of the Death Guard fleet takes three hours to wipe out the defences of Dominica Minor. At nearly the same time, a single ship of the Sons of Horus convinces the people of Moab to turn on themselves to earn the mercy of the Warmaster.[46]
Tenebrae Mission - Alpha Legion Squad Sigma redirects Tenebrae 5-90, an asteroid containing a Mechanicum/Alpha Legion research station and a Warp-manipulating xenos device, to fall into the star 66 Zeta-octis.[54]
In the wake of psychic warfare and warpcraft used against the Five Hundred Worlds, Roboute Guilliman reinstates the Librarius, defying the Edict of Nikaea for the duration of the emergency.[50a]
Veridian Mandeville relay station Tertius receives a message from Ultramarines Captain Alcheios requesting confirmation of mission parameters for the Ghaslakh Campaign.(7.854.007.M31)[56]
Battle of Percepton Primus (004.008.M31) . Although the war for the system ends in twenty-seven minutes, after the Word Bearers cripple the Ultramarines space fleet, ground resistance continues for one hundred and sixty four days.[58]
Battle of Bodt - Autek Mor of the Iron Hands leads an attack on Bodt, the principal fief world of the World Eaters. He uses his fleet's ordnance to knock Bodt's moon out of its stable orbit and crash it into the planet's surface, wiping out all life. Before the moon falls, Mor plunders a stasis casket from a vault deep below the surface of the planetary capital, Tredecimmia. The casket bears the sigils of Terran gene-wrights that helped the Emperor create the Primarchs.[16b]
Burning of Ohmn-Mat - The forge world of Ohmn-Mat succumbs to civil war. The atmosphere is ignited, consuming the world in flame and triggering the detonation of the forges' atomantic reactors. The world is bathed in fire that will last for decades.[16a]
Isessos Genocide - Alpha Legion strikes in the Isessos system cause severe casualties. Those returned to the colonies for treatment are found to be infected with a harmless algal strain. The strain jumps from its human hosts to the agri-worlds' produce fields and wipes them out, leading to ninety billion deaths by famine and political destabilization of the system.[16c]
Xana Incursion - A hand picked strike force of Legiones Astartes, including many Blackshields who have remained loyal to the Emperor, is sent to the forge world of Xana to destroy a delivery of Ordinatus war machines that would have sealed Xana's allegiance with Horus.[16c]
The Emperor personally intervenes to end the War Within the Webway. His leaving the Golden Throne requires the Unspoken Sanction be enacted; the Silent Sisterhood is ordered to collect psykers from Imperial worlds to be placed around the Throne and drained of their power to sustain its functions of maintaining the seal on the Webway gate.[67]
The Raven GuardbattlecruiserSabalis Liberatus breaks into realspace near Galaspar. A traitor Imperial patrol fires on them, but the Raven Guard board and capture their vessels. Sabalis Liberatus begins a two-year trek toward Terra.[16d]
By this time, the Night Lords are no longer an organised fighting force, but a band of sadistic madmen who inflict violence and terror for its own sake.[16h]
Alpha Legion sleeper cells are activated in the Solar system, causing widespread disruption and panic. A massed fleet of the Legion enters the system and is thrown back at the Battle of Pluto. All information concerning the Alpha Legion's presence in the Solar system, including the death of Alpharius in the battle, is classified on the order of Rogal Dorn.[75x]
Following proof that the Emperor lives, Imperium Secundus is abolished by Roboute Guilliman, Sanguinius, and Lion El'Jonson. The Blood Angels, Ultramarines, and Dark Angels leave Ultramar and attempt to reach Terra through the Ruinstorm. They instead reach Davin, the heart of the Ruinstorm, and destroy the corrupted world. While Sanguinius and most of the Blood Angels arrive at Terra, his brothers take their Legions to harry the traitors and slow their advance.[76]
The Ultramarines chase the Alpha Legion to Eskrador. Roboute Guilliman leads a strike force of three thousand Ultramarines in a Codex-defying raid on Alpharius' command bunker. Guilliman kills Alpharius with one blow and has his body burned. The Alpha Legion and the natives of Eskrador continue to harass the Ultramarines until they regroup to orbit and bombard the surface.[2d]
An Ultramarines task force captures the Word Bearers battleship Chronicle of Ashes in the Dominion of Storms. The upper decks of the Chronicle contain etchings of the Word Bearers' history, including information previously unavailable to Imperial scholars.[15a]
Rogue trader Erasmus Skathe travels to Cairn in the Nostramo sector for salvage. His expedition finds the world dead, inhabited by degenerate humans, and evidence that an unknown Legiones Astartes force annihilated the world's defences and trapped its inhabitants in the sub-levels of its hive cities.[16i]
Second Founding - The nine loyal Space Marine Legions are divided into new Chapters during the Great Scouring. The Apocrypha of Skaros asserts that the Ultramarines Legion became twenty-three Chapters. No Chapters are recorded as descended from the Salamanders. The Grey Knights are secretly created and designated Chapter 666.[2k][2l][83][84]
022.M31
The Chronicle of Ashes is cleansed, tech-exorcised, and rededicated as the Lex Talonis. The Ultramarines present it to the Nemesis Chapter.[15a]
ca. 022.M31
Disappearance of Corvus Corax - Corvus Corax leaves his self-imposed seclusion after a year and a day and takes a ship toward the Eye of Terror. His last known communication is simply "Nevermore."[2j]
Alpha Legion warlord Dynat "Crowbane" Mal retreats to the Mandragoran Stars and gathers a thousand-strong force of traitors, diabolists, and renegades around him. He fends off all Imperial attacks against him and destroys the Imperial outpost at Amarah, effectively removing the Imperial presence from the region, which is now known as the Dark Marches.[85]
A text known as The Empyreal Truth is officially suppressed.[15e]
200 - 299.M31
Year
Event
211.M31
Disappearance of Leman Russ - Leman Russ leaves The Fang on the day of the Feast of the Emperor's Ascension, taking all his favoured warriors with him except for Bjorn. He does not tell anyone else of the Space Wolves where he is going or when he will return.[27b][90]
The Black Templars ship Valorous Vow enters the Sol system. Imperial search parties discover the body of High MarshalSigismund. The words "We are returned" are carved into the metal of his Black Sword. The ship's databanks are found to contain copious amounts of data concerning the First Battle of Cadia and Astartes helmet recordings of the duel between Sigismund and Ezekyle Abaddon. The Black Legion officially declares the start of the Long War.[95]
The following information is not to be regarded as officially sanctioned and/ or is not written from an in-universe point of view. A detailed explanation of the term "Trivia" as used in the Lexicanum can be found here.
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