Saviour of Calth
Remus Ventanus was Captain of the 4th company of the 1st Chapter of the XIII Legion Ultramarines at the time of the outbreak of the Horus Heresy. His actions during the treachery of the Calth muster arguably saved the Ultramarines from complete disaster, when he rallied surviving loyalists during the battle and lead them in an effective counter attack against the traitors. Ventanus continued to lead the Ultramarines during the ensuing Underworld War, and in the aftermath of the Heresy he oversaw exterminatus operations on the Word Bearers’ homeworld.
This, this is what astartes should look like, not the Buzz primiris light years