Board Thread:Warhammer 40k General Discussion/@comment-91.224.27.226-20131031140001/@comment-66.206.224.153-20131225134743

I had a theory that the II and IX primarchs were scattered like the others, only never found, maybe killed in their crib by Deathworld monsters, but it seems that II and IX legions actually existed.

If one of them was wiped out by the Space Wolves on behalf of the Emperor, I believe that they were wiped out completely. The swelling of the Ultramarines' numbers may have happened at around the same time (give or take a few centuries), but this is a result of Gulliman's running a great big chunk of the galaxy from which to gather recruits.