House Ixion was an ancient bloodline which, like House Catherion, went into decline following the social upheaval prompted by the Great Houses' imposition of history on the universe. As House Lineacrux and House Mirraflex rose to take its place, the physical House itself became all but deserted by the time of the Imperator.
As the Order declined, the House fell into true abandonment and the Ixion bloodline into extinction. It may have been subsequently used as a site for the rearing of babels. (PROSE: The Book of the War)