Sabbat Worlds Crusade
The Sabbat Worlds Crusade is a big part of Black Library's Warhammer 40,000 fluff about a campaign that so far has taken 23 years and counting to complete. The campaign started in 755.M41 and is still ongoing. It was a setting created by the legendary Dan Abnett for somewhere to place his first novel in the 40K universe.
The Sabbat Worlds is a region of space on the edge of Segmentum Pacificus that was first annexed for Imperial colonization in the 35th Millennium. This often volatile region of space is composed of over 100 inhabited star systems, subdivided into a number of discrete territories or Sub-sectors, most notably the Newfound Trailing, the Khan Group, the Cabal Systems, the Carcaradon Cluster and the Erinyes Group. It is named for the leader of the crusade that liberated them Saint Sabbat. Sabbat was a humble farm girl who had a vision from the Emperor to bring the sector into the fold of the Imperium.