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The Eastern Fringe

The Eastern Fringe of the galaxy

The Eastern Fringe is a frontier region of the galaxy adjacent to but not officially part of the Ultima Segmentum, on the very "eastern" galactic edge of the Imperium of Man. The T'au Empire originated in this area.

The Eastern Fringe is also the home of the Realm of Ultramar that is ruled by the Ultramarines Chapter of Space Marines.

The Eastern Fringe is so far from the heart of the Imperium in the "western" Segmentum Solar that the psychic beacon of the Astronomican does not reach across its entire length.

The region remains largely unexplored by the Imperium and other than Ultramar contains widely dispersed and isolated Human colony worlds.

It may be home to a variety of xenos species other than those that are a part of the T'au Empire, though these species also remain largely unknown to the Imperium.

It is said that the Necron Sautekh Dynasty is rapidly becoming a major threat to the Imperium from its worlds in the Eastern Fringe.

Of the Human worlds known to exist in the Eastern Fringe, many are barbarous and uncivilised though a few maintain the standard level of Imperial technology.


  • 789.M35 First Contact with the T'au - The homeworld of the T'au species, T'au, is discovered and catalogued by the Adeptus Mechanicus Explorator starship Land's Vision. An unusually violent Warp Storm in the region renders any return to the world for Imperial military forces impossible.
  • 742.M41 Damocles Gulf Crusade - The T'au are rediscovered by the Imperium when they begin to expand into Imperial space and the Imperium of Man unleashes the Damocles Gulf Crusade upon the T'au Empire. The Imperial forces are forced to withdraw when Hive Fleet Behemoth assaults the Eastern Fringe.
  • 997.M41 Third Sphere Expansion - The third major expansionary drive of the T'au Empire in the Eastern Fringe begins.

Notable Locations[]

  • Sautekh Dynasty

Notable Systems, Sub-sectors and Sectors[]

  • Dovar System
  • Lagan System
  • Pandraxx Sub-sector
  • Aegis Sector
  • Gulgorahd Protectorate
  • Kiltor Sector
  • Thramas Sector


  • Codex Imperialis (1st Edition)
  • Codex: Tau (3rd Edition)
  • Codex: Tyranids (4th Edition)
  • Codex: Necrons (5th Edition), pg. 10
  • The Horus Heresy Book Nine - Crusade (Forge World Series), pp. 71-80