House Taranis is a Loyalist Imperial Knight House with strong ties to the Adeptus Mechanicus. The first of the knightly houses to be established in the galaxy was that of House Taranis. This truly ancient house predates any other by many hundreds of standard years, for it was first founded on Mars during the Age of Terra. 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 fleets during 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 wer