House Drakon was a formerly loyalist Imperial Knight household that repudiated its oath of loyalty to the Imperium of Man in 550.M37, the first to do so in a millennium. Disappearing for more than a thousand years, they reemerged in 986.M38 at the head of a massive Chaos host of the Dark Mechanicus. They are eventually defeated by the Iron Hands Space Marine Chapter and the lone Freeblade Knight, known as Justice. Though House Drakon's Knights manage to flee, their strength has been greatly reduced.