Mars, ancient homeworld of the Adeptus Mechanicus, in the 41st Millennium. The Ring of Iron can be seen encircling it.

The Ring of Iron is the name given to the massive complex of orbital shipyards, refineries and construction facilities that encircle the equator of the Adeptus Mechanicus' homeworld of Mars in the Sol System.

The exploratory and expeditionary fleets of the Emperor of Mankind's Great Crusade were constructed in the orbital shipyards of the Ring of Iron during the late 30th and early 31st Millennia.

During the Horus Heresy in the Schism of Mars, the Dark Mechanicum struck against the Ring of Iron and damaged large portions of its facilities. The terrible destruction could be seen from the surface of Mars as a blazing fire in the sky.

After the end of the Heresy and the reestablishment of Imperial rule over Mars, the Ring of Iron was repaired and put to work once more churning out the starships of the newborn Imperial Navy and the Imperial merchant fleets.

In the late 41st Millennium, spacecraft and other large starfaring structures are constructed within the Ring's extensive orbital factories, and many of the warships of the Battlefleet Solar are based in its huge floating docks. It is considered the largest known man-made structure in the Milky Way Galaxy.



Warhammer 40,000 Grim Dark Lore Part 8 – Imperium


  • Codex: Adeptus Mechanicus - Cult Mechanicus (7th Edition), pg. 21
  • Mechanicum (Novel) by Graham McNeill
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Warhammer 40,000 Overview Grim Dark Lore Teaser TrailerPart 1: ExodusPart 2: The Golden AgePart 3: Old NightPart 4: Rise of the EmperorPart 5: UnityPart 6: Lords of MarsPart 7: The Machine GodPart 8: ImperiumPart 9: The Fall of the AeldariPart 10: Gods and DaemonsPart 11: Great Crusade BeginsPart 12: The Son of StrifePart 13: Lost and FoundPart 14: A Thousand SonsPart 15: Bearer of the WordPart 16: The Perfect CityPart 17: Triumph at UllanorPart 18: Return to TerraPart 19: Council of NikaeaPart 20: Serpent in the GardenPart 21: Horus FallingPart 22: TraitorsPart 23: Folly of MagnusPart 24: Dark GambitsPart 25: HeresyPart 26: Flight of the EisensteinPart 27: MassacrePart 28: Requiem for a DreamPart 29: The SiegePart 30: Imperium InvictusPart 31: The Age of RebirthPart 32: The Rise of AbaddonPart 33: Saints and BeastsPart 34: InterregnumPart 35: Age of ApostasyPart 36: The Great DevourerPart 37: The Time of EndingPart 38: The 13th Black CrusadePart 39: ResurrectionPart 40: Indomitus
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