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It was inducted into the Imperium during the Horus Heresy by the Raven Guard, and was named after Admiral Kathur of the Imperial Army, who had defended it from the Death Guard shortly after the closing of the Heresy. During the 13th Black Crusade, it was later source of a massive outbreak of the Zombie Plague, caused by a source independent of the Warmaster or his forces.
A beacon of faith, Kathur was a memorial to an Imperial Saint of the same name. Hearing of Kathur's fate and unwilling to allow a symbolic defeat, the Imperium pulled back several regiments from the front line of the Black Crusade, which had originally been tasked to retake Cadia. They were assisted by half a company of the Raven Guard (who were there to protect their chapter's legacy) and forces of the Inquisition (who were investigating the Zombie Plague). This action was known as the Kathurite Reclamation.
|This page contains spoilers for:||Cadian Blood (Novel)|
The Imperium, believing the threat to be a relatively minimal, sent a small spearhead force to gain a toehold at the capital of Solthane and await the main body of the reclamation force to occupy and reclaim the planet. The spearhead force, consisting of just a handful of regiments, the half-company of Raven Guard, and their collective support fleet, was several months ahead of the main body. They were also given the order, on behalf of the Ecclesiarchy, to avoid using ordnance and heavy weapons to prevent further desecration Solthane. Without their heavy weapons and a relatively scant force, they were woefully unprepared when they encountered the Death Guard Traitor Legion, led by Typhus the Traveller. The Death Guard were trying to find the source of the outbreak, believed to be contained on a Heresy-Era Death Guard battle barge, if not the ship itself.
The Reclamation forces were able to locate the ancient battle-barge underneath the central cathedral, just before the traitors, and killing its sole resident, the Daemon Prince Arlus. Sensing his cause for the incursion fading away, Typhus gave up on the world, and returned to the Warmaster's side.