Warhammer 40,000 Timeline by Era

The Warhammer 40,000 timeline in 6 eras, oldest first. Each of the 594 books in the catalogue sits in the era where its story starts; a book dated only to its millennium sits in that millennium's era. Open an era to read its books in timeline order.

• The Great Crusade (M30)11The Emperor's war to reunite the scattered worlds of humanity, fought by his Primarchs and their Space Marine Legions.
• The Horus Heresy (M31)135The civil war in which the Warmaster Horus turned half the Legions against the Emperor, ending with the Siege of Terra in 014.M31, and the Scouring that hunted the traitors afterwards.
• The Forging (M32)13The centuries after the Heresy, when the Imperium rebuilt and spread again, and in the War of the Beast nearly fell to an Ork warlord.
• The Age of Imperium (M33–M40)4Eight millennia between the Forging and the 41st millennium: the Nova Terra Interregnum, the Age of Apostasy, the Age of Redemption and the Waning.
• The 41st Millennium (M41)375The setting of most of the fiction: an Imperium at war on every front with Chaos, the xenos and itself, until the Fall of Cadia at the millennium's close.
• Era Indomitus (M42)56The age after the Great Rift split the galaxy, when Roboute Guilliman returned and led the Indomitus Crusade.