The Conqueror's Chosen were a Khornate Chaos Space Marine warband led by the Chaos Lord Aahrgoth the Conqueror. For millennia, the Conqueror's Chosen wrought havoc upon the worlds of the Segmentum Obscurus, operating a respectably-sized warfleet out of the Eye of Terror. The Conqueror's Chosen were responsible for attacks on thousands of Imperial worlds over the course of their existence, most notably the worlds of Thraxus and Archorum, both of which had their populations completely massacred at the hands of the Chosen.
Unlike most Khornate warbands based out of the Eye of Terror, the Conqueror's Chosen were not believed to have been a splinter fraction of the fragmented World Eaters traitor legion. Because of this, the warband's size is relatively small, but this is more than made up for by the skill and experience of the warband's members. Aahrgoth allowed only proven warriors to join the Chosen's ranks, and thus even new members of the warband are blooded veterans of hundreds or even thousands of battles, with impressive numbers of kills beneath their belts.
The Chosen have sown terror among the worlds bordering the Eye of Terror since at least the 33rd Millennium, bringing numerous worlds under the fold of Chaos. Most recently, the Conqueror's Chosen have taken part in the Ulgroth Crusade, before going on to play a minor role in Abaddon the Despoiler's 13th Black Crusade.