Horus Heresy Timeline

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A Timeline of the Horus Heresy.

• Note: Not all events of the Heresy can yet be categorized
• Note: Some dates are approximate estimates based upon the chronological events of the series itself

Year	Event	Notes
964.M30	The Emperor and Ultramarines destroy Monarchia[1]	Lorgar begins his Pilgrimage
965.M30	ALL DATA REDACTED[1]	Incident involved the Space Wolves
966.M30	Cadia enters the Imperium[1]	Lorgar completes his conversion to Chaos
969.M30	ALL DATA REDACTED[1]	Incident involved the Space Wolves
981.M30	Alpharius Omegon assumes control of the XXth Legion[1]	The last Primarch is discovered by the Emperor
984.M30	Konrad Curze destroys his homeworld of Nostramo[1]
994.M30	The Isstvan System is brought into compliance by the Raven Guard[1]
000.M31	The Ullanor Crusade[1]	Horus is named Warmaster after the victory and the Emperor returns to Terra for his secret project
000.M31	The Cleansing of Laeran. Fulgrim discovers the Silver Blade of Laer[3]	Beginning of Fulgrim's descent into madness
000.M31	The Chondax Campaign begins[1]
001.M31	The Council of Nikaea[1]	The Emperor bans the use of Librarians among the Legiones Astartes
001.M31	With the aid of John Grammaticus, Alpharius Omegon is shown a prophetic vision by the Cabal that convinces them to betray the Emperor and side with Horus in the coming rebellion in order to save Humanity.[7]
002.M31	Erebus steals the Anathame from the Interex[2]	Beginning of the Word Bearers plan to initiate an uprising against the Emperor. The weapon will be used to convert Horus to Chaos
003.M31	The Imperium loses contact with the Isstvan System[1]
003.M31	The Luna Wolves and renamed the Sons of Horus[1]
004.M31	The Battle of Davin's Moon.[1] Horus falls to Eugen Temba armed with the Anathame. He is resurrected by the Serpent Lodge and secretly pledges to overthrow the Emperor. Magnus' attempt to warn his father of the treachery create a catastrophic psychic backlash on Terra, causing the Emperor to dispatch Leman Russ to Prospero	Events orchestrated by Erebus, beginning of the War Within the Webway on Terra that will leave the Emperor indisposed for the rest of the Heresy.
004.M31	Horus kills Fabricator Consul Emory Salignac of the Auretian Technocracy, triggering a ten-month war with the Technocracy.[8]	The war was orchestrated by Horus to obtain STC's in order to secure an alliance with Kelbor-Hal
004.M31	Perturabo destroys Olympia after a rebellion[1]
004.M31	Horus works secretly to convert Fulgrim, Mortarion, Angron, Konrad Curze, Perturabo, and Alpharius to his cause. Those he judges too loyal are dispatched on campaigns far from Terra.[16]
005.M31	The Blood Angels disappear en-route to Signus Prime[1]
005.M31	The Dark Angels are dispatched to the Eastern Fringes by Horus[1]	Ploy by Horus to move his potential enemies away from Terra
005.M31	The Battle of Isstvan III. Horus declares open rebellion against the Emperor. The Sons of Horus, Emperor's Children, World Eaters, and Death Guard purge loyalist elements of their Legion's.[1]	End of the Great Crusade, beginning of the Horus Heresy
005.M31	The Flight of the Eisenstein. Nathaniel Garro of the Death Guard leads a force of loyalist survivors from Isstvan III through the Warp towards Terra to warn of Horus' treachery[13]
005.M31	The Burning of Prospero.[1] Magnus is broken by Leman Russ and teleports the survivors of the Thousand Sons to the Planet of the Sorcerers
005.M31	The Eisenstein arrives at Luna. The Battle of the Somnus Citadel. Terra learns of the rebellion by Horus[13]	Malcador the Sigilite forms the Knights-Errant in the aftermath, led by Garro
005.M31	The Schism of Mars begins[1]	War will continue for the next year
005.M31	The Battle of Diamat. Lion El'Jonson and the Dark Angels battle traitor forces and encounter Perturabo who is on his way to Isstvan V. However the Dark Angels Primarch is unaware of his secret allegiance to Horus and the two part ways.[15]	Meanwhile on Caliban, Luther begins defying the Lion and forms the first of The Fallen
006.M31	The Drop Site Massacre.[1] The Word Bearers, Alpha Legion, Night Lords, and Iron Warriors reveal their treachery and take part in the annihilation of the Raven Guard, Salamanders, and Iron Hands. Ferrus Manus is killed and Fulgrim becomes possessed by a Daemon. Vulkan is taken prisoner by Konrad Curze. Corax begins a guerrilla war against traitor forces for the next several weeks before being rescued.	Shortly after the battle, Magnus sends word to Horus of his interest in an alliance.
006.M31	The Battle of Signus Prime.[3] Sanguinius proves himself incorruptible[4]	The Red Thirst manifests on a large open scale among the Blood Angels for the first time
006.M31	The Invasion of Paramar V[4]
006.M31	Iron Warriors loyal to the Emperor defend the Schadenhold from their traitor brethren in a siege lasting a year and a day, Terran standard.[11]
006.M31	Mars falls to the Dark Mechanicum[4]
200007.M31	Corax arrives in the Sol System and receives new gene technologies from the Emperor to create new enhanced warriors[5]	Omegon begins plans to steal the new technology
007.M31	The Battle of the Phall System[4]
007.M31	The Battle of the Perfect Fortress
007.M31	The Battle of Deliverance[5]	Corax halts the production of his enhanced warriors, the Alpha Legion secretly acquires the technology
007.M31	The Battle of the Coronid Deeps[4]
007.M31	The Battle of Calth.[4] The Word Bearers reveal their treachery to the Ultramarines.	The Ruinstorm forms in the aftermath, cutting off Ultramar from the greater Imperium
007.M31	A strike force of loyalist Astartes destroys the Word Bearers ship Furious Abyss before it can attack Macragge[12]
007.M31	The First Siege of Hydra Cordatus
007.M31	Perturabo and Fulgrim journey to the Eye of Terror to find the Angel Exterminatus, where the latter betrays the former to transform himself into a Daemonic entity[6]
007.M31	The Shadow Crusade begins with the Battle of Armatura[4]	Massacres are designed by Lorgar to feed the growing Ruinstorm
007.M31	The Thramas Crusade begins[4] as the Night Lords begin a genocidal rampage across the Eastern Fringe to bog down the Dark Angels
007.M31	Nathaniel Garro, Tylos Rubio, and Macer Varren return to Isstvan III and discover that former Luna Wolves Captain Garviel Loken is alive[14]	Loken mentally rehabilitated and inducted into the Knights-Errant
~007.M31	The Tenebrae Mission	Omegon seemingly sabotages the Traitor effort to keep the White Scars from knowing about the Heresy
007.M31	The Battle of the Alaxxes Nebula[4], the Space Wolves are devastated by a Alpha Legion ambush but ultimately manage to escape
007.M31	The Chondax Campaign ends[4] as the White Scars break through a Alpha Legion blockade and head towards Prospero
007.M31	The Second Battle of Prospero, the White Scars and Death Guard clash	The last Primarch of unknown allegiance, Jaghatai Khan, declares himself for the Emperor
007.M31	The Solar Campaign begins[4]
~008.M31	The Battle of Perditus. Lion El'Jonson and the Dark Angels defeat a Death Guard force under [[Calas Ty[hon]] and acquire an alien device that allows them to conduct far more efficient Warp travels
008-013.M31	The Underground War begins in the aftermath of the Battle of Calth[4]
008.M31	Traitor forces conquer Mezoa[4]
008.M31	Traitor forces conquer Manachea[4]
008.M31	The Shadow Crusade ends.[4] Angron is transformed into a Daemonic entity
008.M31	The Battle of Molech[4]	Horus seemingly gains the powers of the Emperor
009.M31	The Thramas Crusade ends[4] with the Night Lords scattering following an ambush by the Dark Angels	Konrad Curze begins hiding within Lion El'Jonson's flagship Invincible Reason
009.M31	The Defense of Coronis Agathon[4]
009.M31	Fearing Terra lost, Roboute Guilliman declares Imperium Secundus[4]	Using the Pharos, loyalist ships lost in the Warp due to the Ruinstorm will find their way to Macragge
009.M31	Lion El'Jonson and a contingent of Dark Angels arrive in Imperium Secundus. Konrad Curze escapes the Invincible Reason and rampages across Macragge. An insane Vulkan is recovered by the loyalists.[9]	Sanguinius arrives at Macragge shortly after and is declared Regent of Imperium Secundus
009.M31	The Battle of Sotha
010.M31	The Battle of Nocturne[10]	Vulkan is restored shortly after
010-011.M31	The Battle of Tallarn[4]
014.M31	Traitor forces reach the Imperial Capital, beginning the Siege of Terra.[4] After killing Sanguinius, Horus is slain in the final battle with the Emperor. The Traitor Legion's retreat, effectively securing Loyalist victory in the Horus Heresy	The Great Scouring begins in the aftermath of the Traitor defeat. Traitor forces begin their retreat to the Eye of Terror

Sources

• 1: The Horus Heresy Book Two - Massacre pg.19
• 2: Horus Rising (Novel) Chapter 7
• 3: Fulgrim (Novel)
• 4: Horus Heresy Weekender Presentation 2016
• 5: Deliverance Lost (Novel) Chapter 5
• 6: Angel Exterminatus (Novel) Chapter 23
• 7: Legion (Novel) Chapter 10
• 8: False Gods (Novel) Chapter 19
• 9: The Unremembered Empire (Novel)
• 10: Deathfire (Novel)
• 11: Age of Darkness: The Iron Within
• 12: Battle for the Abyss (Novel)
• 13: Flight of the Eisenstein (Novel)
• 14: Garro: Legion of One
• 15: Fallen Angels (Novel)
• 16: Galaxy in Flames (Novel)