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The first Knightly House to be established, House Taranis was founded on [[Mars]] before the formation of the [[Imperium]]. This truly ancient house predates any other by many hundreds of years. As the industries of the red planet developed into a vast metropolis of technological mastery, so too did it evolve to become the first and foremost of the forge worlds, and the Knights of House Taranis were its guardians. The [[STC]] technology supplied to many of the [[Expeditionary Fleet]]s during [[Great Crusade|Mankind’s expansion]] across the stars included designs for armoured suits of exo-armour based on those first developed to be used by the Knights of Taranis. When the Knight worlds were first rediscovered during the Imperium’s [[Great Crusade]] many thousands of years later, it is likely that the Mechanicum used their intimate knowledge of the Knight suits worn by House Taranis to help win the loyalty of those worlds.{{Fn|2a}} By the start of the [[Horus Heresy]], Taranis fielded some 600 Knight suits, including large numbers of rarer [[Porphyrion]], [[Atrapos]], [[Magaera]],a nd [[Styrix]] Patterns.{{Fn|13}}