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year event sources
Designs for the original Leman Russ Conqueror discovered. Imperial Armour Volume One - Imperial Guard and Imperial Navy[Needs Citation]
Several fleets carrying intelligent telepathic centauroid creatures appear through the Tempestus and Ultima Segmentae. They claim to be denizens of Colossus fleeing enslavement and try to settle inside the borders of the Imperium. After being declared xenos horribilis in the early 39th millennium, they are completely wiped out. Last known ship is destroyed above Zorastra in 226.M39.

In the late 41st millennium it is concluded that they were fleeing the Tyranids.

Codex: Tyranids (4th Edition) page 25
The Chaemos Rebellion White Dwarf 286 (UK), pg.27
An Adeptus Ministorum crusade frees Alpha Shalish from xenos occupation. The Ecclesiarchy will use the planet as a launching pad for further crusades. Warhammer 40,000 6th Edition Rulebook pg. 199
034.M38 Alpha Legion Strikemaster and daemon prince Kernax Voldorius uses a Dark Age of Technology-era weapon called the Bloodtide to kill billions. Warhammer 40,000 5th Edition Rulebook pg. 125; Warhammer 40,000 6th Edition Rulebook pg. 171; Hunt for Voldorius[Needs Citation]
089.M38 Zarona Intervention. Inquisitor Galleus and army of Dark Hunters Chapter and Imperial Guard of Cadia fought there with the traitors of Zarona. Imperial Armour Volume Two - Second Edition: War Machines of the Adeptus Astartes, pg. 18
112.M38 The survivors of the Abyssal Crusade return from the Eye of Terror and kill the Chaos-tainted Saint Basillius. Codex: Chaos Space Marines (6th Edition) pg. 23
113.M38 Civil unrest begins in the Orpheus Sector. The heresy of Von Mallas the Transgressor finds purchase in the sector during this period. The combination of discord, uprisings, and suppression strains interplanetary commerce, heralding famine and pestilence again and again. Imperial Armour Volume Twelve - The Fall of Orpheus pg. 20
116.M38 The Changeling infiltrates the Eldar craftworld Il'sariadh as a Harlequin Solitaire. It summons The Masque during the Harlequins' performance. An Aspect Warrior host stops a full-scale daemon incursion, but the craftworld's culture is irrevocably crippled. Codex: Chaos Daemons (6th Edition) pg. 21
182-453.M38 The Bellrath Crusade. Imperial Armour Volume Ten - The Badab War - Part Two, pp. 97–98
220.M38 The Howling Griffons lose Chapter Master Orlando Furioso, much of the First Company, the entire Eighth Company, and a battle barge in a Night Lords and Word Bearers ambush led by Lord Periclitor. Imperial Armour Volume Nine - The Badab War - Part One, pp. 124, 126
237.M38 Subodai of the White Scars takes a warrior pilgrimage through V'run, Jurn, and the Taleris Belt Codex: Space Marines (4th Edition) inside back cover
299.M38 During the wider Altid Crusade, the Dark Angels assault the planet Altid 156 against protocol. Thanks to their successful slaying of the separatist's leader Elucidax the Keeper (the Fallen Angel Zeriah), no inquiries are made. Codex: Dark Angels (4th Edition) pg. 19; Codex: Dark Angels (6th Edition), pg. 24
601390.M38 The Rogue Trader House of Ecale and the Marines Errant Space Marine Chapter seal a covenant in blood. The entire Chapter accompanies Sia'hadn Ecale on a 43 year expedition in the Ghoul Stars. Ever since then contingents of the Marines Errant have served alongside the Rogue Trader House. Imperial Armour Volume Nine - The Badab War - Part One, pg. 76
437.M38 Iybraesil Eldar Craftworld first detected in West Quadrant, Segmentum Obscurus. Codex: Eldar (3rd Edition)[Needs Citation]
514.M38 Eldar from Ulthwé craftworld battle the Dark Eldar Kabal of the Jade Knife for control of a Webway spar. The war kills thousands on both sides, prompting the leaders of both factions to call an uneasy truce. Codex: Eldar (6th Edition) pg. 21
555.M38 First Savaven Crusade of the Order of the Valorous Heart Battle Sister against the cult of crypt-dwelling tomb-helots of Savaven Imperial Armour Volume Two - Second Edition, pg. 18
573.M38 The 9th Black Crusade of Abaddon the Despoiler begins. Codex: Chaos Space Marines (6th Edition) pg. 23
4393597.M38 Inquisitor Tybalt Maul submits a report to his superiors concerning the Iron Warriors' destruction of the fortress-archive at Auxesia. White Dwarf 267 (US) pg. 37
606-792.M38 The Tau Empire fights a protracted campaign against the Orks. The campaign is bloody but ultimately won thanks to the Earth Caste's development of pulse rifle technology. Dal'yth sept is founded. Codex: Tau Empire (6th Edition) pg. 28
666.M38 The Ravenwing loses three Grand Masters this year, all in pursuit of the Fallen. For the next two decades, the Second Company Master of the Angels of Vengeance directs the Ravenwing while the Chapter leadership evaluates candidates for the position. Codex: Dark Angels (6th Edition), pg. 24
715.M38 The Celestarii cult rises in the Orpheus Sector. It preaches that the Imperial Creed is false and that superior creatures slumber; when they awaken, they will grant their faithful eternal life and bloody death to their enemies. The cult takes control of xeno-archeological remains across the sector and secretly enriches its inner circle and carries out cannibalistic rituals. Imperial Armour Volume Twelve - The Fall of Orpheus pg. 20
733.M38 Warmaster Demetrius begins the Salonika Crusade Codex: Imperial Guard (5th Edition) pg. 7
755.M38 Siege of Balle Alpha Imperial Armour Volume Two (Second Edition), pg. 18
770-791.M38 The Great Malagantine Purge. Hundreds of billions are killed in the heretical Malagantine Sector. Imperial Armour Volume Nine - The Badab War - Part One, pp. 68–69
788.M38 Ecclesiarch Deacis VI creates two more Orders Militant of the Adepta Sororitas: the Order of the Bloody Rose and the Order of the Sacred Rose. Codex: Sisters of Battle (2nd Edition)[Needs Citation]
857.M38 The Siege of Helios Imperial Armour Volume Two - Second Edition, pg. 18
873.M38 Skopios Incident: the Explorator Vessel Incalculus Stellar brings an alien edifice to the Skopios asteroid research base. An unknown enemy (possibly C'tan?) takes over the base and turns it over to manufacture of skeletal robots (Necrons?). The 22nd Elysian Drop Troops destroy the base and it is declared Purgatus for three hundred years. GW's Armageddon 3 web site (accessed 2007.06.18)
884.M38 The Tau forge their alliance with the Kroot. Codex: Tau Empire (6th Edition) pg. 28
889.M38 The Agri-World Tlaloc sends a garbled distress signal. Battlefleet Orpheus responds and finds the planet dead. There are no intact bodies or data storage devices to be found. Ordo Xenos Inquisitor Kussan proposes that the Dark Eldar are responsible. The sector's Lord Commander orders the planet quarantined. Imperial Armour Volume Twelve - The Fall of Orpheus pgs. 20-21
948.M41 First Scouring of Coriolanthe Imperial Armour Volume Two (Second Edition), pg. 18
956.M41 The Tau First Sphere of Expansion ends [Needs Citation]
967.M38 Kruellagh the Vile, Archon of the Kabal of the Flayed Skull, leads a raid that massacres the Bluebloods 87th Regiment of Imperial Guard. Captain Anton Mossman survives, only to die during his questioning by the Inquisition. Codex: Dark Eldar (3rd Edition)[Needs Citation]
999.M38 An Avatar of Khaine from Craftworld Biel-Tan confronts a powerful Daemon of the Maledictum; the Daemon is defeated, but the Avatar's Wailing Doom is shattered by a Deathwatch Kill Team and one of its shards taken, later to form the core of the Daemonhammer God-Splitter. Dawn of War (Novel) - Blood Ravens: The Dawn of War Omnibus (Omnibus) by C.S. Goto, Prologue, pp. 15–28

M37 Timeline M39