Horus Heresy Chronology

Presented below is an exhaustive listing of all known campaigns and battles that occurred during the galaxy-wide conflict known as the Horus Heresy in the early 31st Millennium. By no means is this list complete, as much of this information presented in various canon sources is often ambiguous and often times contradictory. Therefore, this is merely a rough guide to the chronological order of the events, as they occurred, during this conflict.

Below, the following information was compiled by manifold and diverse hands at the order of Malcador the Sigillite and the Acting Council of Terra following the outbreak, as well as during, the major events of the Horus Heresy. As more information is uncovered in newly discovered Imperial records, it will be added to the chronology.