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Year Event Source
The Liber Astartes is written about the Ultramarines and their empire of Ultramar. Codex: Space Marines (4th Edition) page 8
No verifiable records pertaining to the Blood Ravens Space Marine Chapter pre-date this time. Index Astartes: Blood Ravens
010.M37 The red giant star in the Maxil Beta system explodes in a cloud of warpflame. Every world for hundreds of light years is touched by the warp; the inhabitants mutating or being possessed by Daemons. The Imperium mobilizes every military asset within fifty light-years, including Grey Knights, a dozen Space Marine Chapters, numerous Imperial Guard regiments and the Sisters of Battle. The disaster is contained at the cost of billions of lives. Warhammer 40,000 Rulebook (6th Edition), pg.170; Codex: Chaos Daemons (6th Edition) pg. 21
011.M37 The High Lords of Terra evaluate the Moirae exiles from the Iron Hands and declare them a new Space Marine Chapter: the Sons of Medusa. Imperial Armour Volume Ten - The Badab War - Part Two pg. 96
020.M37 The Great Cull: the High Lords of Terra order a systematic extermination. Warhammer 40,000 5th Edition Rulebook pg. 125
119-164.M37 The Lok'kroll Xenocide. The Lok'kroll are systematically exterminated by the entire Novamarines Chapter, CIX Phyrus Army Group, squadrons from Battlefleet Ultima and Deathwatch Kill Teams. Imperial Armour Volume Nine - The Badab War - Part One, pp.118-119
266.M37 The Blood Angels, Angels Encarmine, and Blood Drinkers crash a heretical ritual in progress on Hell's Hollow. The ritual opens a portal to allow daemons to enter the Materium. The Death Company is unleashed, sacrificed against the daemonic hordes to close the portal. Codex: Blood Angels (7th Edition) A Chronicle of Heroes
271.M37 Captain T'sen of the Salamanders seeks atonement through a warrior pilgrimage through Rhianna, Colcha, and Armageddon Codex: Space Marines (4th Edition) inside back cover
321.M37 The Abyssal Crusade: Saint Basillius declares that thirty Space Marine Chapters are found wanting in the eyes of the Emperor. The Space Marines concerned embark on a penitent Crusade into the Eye of Terror to cleanse the worlds consumed by the birth of Slaanesh. Warhammer 40,000 5th Edition Rulebook pg. 125; Codex: Chaos Space Marines (6th Edition) pg. 23
361.M37 Defence of Cobalt Valley: Alpha Legion Chaos Space Marines led by Orik the Vile vs. Cadian Shock Troopers on Mihok Secundus. WD240, Defence of Cobalt Valley
502.M37 The Tau First Sphere of Expansion begins
533.M37 The Tau establish their first off-world colony on the largest moon of T'au, Lu'val. Codex: Tau Empire (6th Edition) pg. 28
550.M37 The Occlusiad War begins. The Apostles of the Blind King, rogue Tech Priests, go to war against the Imperium in the north-western fringes. Using artifacts from the Dark Age of Technology, the Apostles are able to detonate several stars in the outer Segmentum Obscurus, forever altering the constellations. The Iron Hands Raukaan Clan, led by Iron Father Daarmos, participates in several notable battles such as the Conflagration of Gold and the Bonehouse Massacre. Warhammer 40,000 5th Edition Rulebook pg. 125; Clan Raukaan - A Codex: Space Marines Supplement (6th Edition)
551.M37 The Lost and the Damned followers of High Anarchist Potchek attack Persembe II, located close to the Eye of Terror. The Dark Angels Third Company under the command of Master Baradiel executes a drop pod assault to cut off Potchek's advance on Kurin's Acropolis. Baradiel kills Potchek and none of his mortal followers manage to escape. Codex: Dark Angels (4th Edition) page 21; Codex: Dark Angels (6th Edition), pg. 24
560.M37 The Occlusiad War ends. Navigator Joyre Macan discovers the location of the Blind King's palace-warship hidden in the Warp and guides the Emperor Class Battleship Dominus Astra into battle. The Dominus Astra destroys the Blind King's palace-warship and without his leadership, his Apostles are swiftly defeated. Warhammer 40,000 5th Edition Rulebook pg. 125
563.M37 Assassin Urhua Thereaux of the Venenum Temple sent to assassinate renegade Governor Yawell. Ship was caught in a warp rift, holding the vessel in a temporal stasis for 698 years. Codex: Assassins (3rd Edition)
678-714.M37 The Taninim Crusades. Eleven Space Marine Chapters are despatched to the Taninim Expanse to destroy any threats to the Imperium lurking there. Imperial Armour Volume Nine - The Badab War - Part One, p.57
756.M37 The Ethereals decree the establishment of Tau'n as a separate sept. Codex: Tau Empire (6th Edition) pg. 28
772.M37 The Daemon-possessed Admiral Koth has Phalan 10 bombarded from orbit for a month. Codex: Chaos Daemons (6th Edition) pg. 21
Planetary governor Sevastos Molokai of Urskas Sol Tetra makes contact with a coven of Word Bearers, intent on increasing his personal power. Eight weeks later, his thriving industral planet has become a daemon-infested nightmare. Codex: Chaos Space Marines (6th Edition) pg. 23
754.M37 The Children's Crusade Warhammer 40,000 Rulebook (6th Edition), pg. 171
759.M37 The Orpheus Sector celebrates the thousand-year anniversary of its founding. The holy corpse of Lord Orpheus is carried throughout the sector, with many miracles and visions reported in its wake. Imperial Armour Volume Twelve - The Fall of Orpheus pg. 17
811.M37 The 7th Black Crusade, also called the Ghost War, begins. The Blood Angels are slaughtered at Mackan. Liber Chaotica: Khorne; Codex: Chaos Space Marines (3rd Edition, 2nd Codex); Codex: Chaos Space Marines (6th Edition) pg. 23
871.M37 The Battle of Midpoint. The Rock and the Dark Angels's Swordfleet arrive in time to save the Midpoint space docks from Eldar pirates. Wreckage from the battle floats in the Argonnes sector to this day. Codex: Dark Angels (6th Edition), pg. 24
883.M37 Zambeque declares open rebellion before the Ravenwing can apprehend its Imperial governor for questioning. The Alpha Legion cuts off the Fifth Company but half the Deathwing arrives to rescue them. The governor, the Fallen Angel Brother Solas, escapes with the Alpha Legion. Codex: Dark Angels (6th Edition), pg. 24
893.M37 The Poctroon are the first species to join the Tau Empire. Disease wipes out the species in only a few generations, while the fortunately-immune Tau claim their homeworld, the prime world of the Bork'an sept. Codex: Tau Empire (6th Edition) pg. 28
956.M37 The Heavenfall Massacres. Warhammer 40,000 5th Edition Rulebook pg. 125
976.M37 All contact is lost with the Leyak Sector. Orpheus Sector authorities increase their military tithes and prohibit all colonial expeditions to the Veiled Stars on pain of death, with several worlds specifically excluded. Imperial Armour Volume Twelve - The Fall of Orpheus pg. 18
987.M37 The entire Ravenwing deploys on Picus, an agri-world in the Orar sub-sector, on the trail of Brother Solas. All ten Darkshrouds participate, bringing near-total darkness to the world, but Solas escapes again. Chapter records cite Cypher as having a hand in Solas's disappearance. Codex: Dark Angels (6th Edition), pg. 24
999.M37 The 8th Black Crusade. Codex: Chaos Space Marines (3rd Edition, 2nd Codex)
late M37 By controversial request of Anaziel, Chapter Master of the Dark Angels, the High Lords of Terra allow the creation of the Disciples of Caliban, a new Space Marine Chapter. Codex: Dark Angels (4th Edition) pg. 74
late M37 Mars perfects efficient production of long-range lance weaponry. Battlefleet Gothic Resources: Ships of Mars page 2

M36 Timeline M38