004-009.M31 Signus Cluster Campaign - The bulk of the Blood Angels Legion is dispatched through the machinations of the Warmaster Horus to the distant Signus Cluster to put down a local uprising.He prepares in secret over the next two Terran years to fight a sudden and ruthless galactic civil war. Though his treachery and malign intent remain hidden, he begins his far-reaching conspiracy to suborn those of his brother Primarchs' Space Marine Legions and the other military forces of the Imperium who will aid him and neutralise the threat of those who will not serve him where he can. From this day forth he makes his plans to bring the Imperium to ruin and topple the Emperor from power. He is healed within the ancient Serpent Lodge on the moon but though his life is saved, his soul is forfeit to the Ruinous Powers. 004.M31 Plague Moon Campaign and the Fall of Horus - The Warmaster Horus is grievously wounded while fighting rebels on the moon of Davin.The Imperial planetary government had collapsed, and the Planetary Governor Vardus Praal, now a turncoat and perhaps become a mutant or psyker, was leading the revolt. 003.M31 Contact Lost with the Isstvan System - Six Terran years after the last official communiqué from Isstvan III, a Death Guard patrol ship on the outer edge of the XIV th Legion's fleet picked up an incomplete astrotelepathic transmission which indicated that Isstvan III was in open religious rebellion against the Imperium.Though the Warmaster Horus turned to the service of Chaos several standard years before the start of the conflict, the Heresy only officially began with the Isstvan III Atrocity as Horus' duplicity was not yet revealed.
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Therefore, this is merely a rough guide to the chronological order of the events during this conflict and no date should be taken as absolutely final should new evidence come to light.īelow is a chronology of the events immediately preceding the start of the interstellar civil war later called the Horus Heresy. When the effects of the deification of the Emperor, the theological needs of the Adeptus Ministorum and the outright deletions and fabrications of Imperial history carried out by the Inquisition are added into the equation, the truth of the events surrounding the Horus Heresy could prove very shocking indeed to the people of the Imperium. The Horus Heresy occurred over ten thousand Terran years ago, a nearly unimaginable span of time as a result, it has become nothing more than a collection of often distorted or misunderstood legends and mythology to the average Imperial citizen of the Era Indomitus. While the below chronology is highly detailed, it should be noted that much of this information would be completely unknown to the average inhabitant of the Imperium of Man in the 41st Millennium.
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Presented below is the Horus Heresy Chronology, an exhaustive listing of all notable campaigns and battles that occurred during the nine-year-long, galaxy-wide conflict known as the Horus Heresy in the early 31st Millennium.īy no means is this list complete, as much of the information presented in various canon sources is often ambiguous and even at times contradictory, as would be expected from events that occurred so long ago and involved such destruction and strife across thousands of light years and tens of thousands of worlds. The Eye of Horus, symbol of the Archtraitor and Warmaster Horus Lupercal