From Lexicanum

Year	Event	Source
	Liber Astartes written - information given on the Ultramarines and their empire of Ultramar.	Codex: Space Marines (4th Edition) page 8
020.M37	The Great Cull: the High Lords of Terra order a systematic extermination.	Warhammer 40,000 5th Edition Rulebook
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 30 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
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
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.	Warhammer 40,000 5th Edition Rulebook
551.M37	Persembe II, closely located to the Eye of Terror, is assaulted legions of heretic, mutants Daemons of the sorcerous High Anarchist Potchek. The Dark Angels 3rd company under the command of Master Baradiel manages to defeat the assault. Potchek is killed by Baradiel, and none of his mortal followers manage to escape.	Codex: Dark Angels (4th Edition) page 21
560.M37	The Occlusiad War ends. Navigator Joyre Macan discovers the location of the Blind King's palace-warship hidden in the Warp and was able to guide the Emperor Class Battleship Dominus Astra into battle. The Dominus Astra destroyed the Blind King's palace-warship and without his leadership, his Apostles were swiftly defeated.	Warhammer 40,000 5th Edition Rulebook
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)
811.M37	The 7th Black Crusade also called the Ghost War begins. The Slaughter of the Blood Angels at Mackan	Liber Chaotica: Khorne, Codex: Chaos Space Marines (3rd Edition, 2nd Codex)
956.M37	The Heavenfall Massacres.	Warhammer 40,000 5th Edition Rulebook
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) page 74
late M37	The Tau were deep in the period known as Mont'au. During this time the Ethereals appeared and ushered in the Tau'va.	Codex: Tau (3rd Edition)
late M37	The ability to efficiently produce long-range lance weaponry by Mars is perfected.	Ships of Mars page 2

M36	Timeline	M38