Almost nothing is known of the Knights of the Crimson Order in Imperial records save that they exist and that they, too, are numbered amongst the ranks of the Unforgiven.
- Legacy of Caliban (Unknown Date.M41) - The Knights of the Crimson Order answered Supreme Grand Master Azrael's summons to return to the system where lost Caliban, the former homeworld of the Dark Angels Legion, once lay. There, the Knights of the Crimson Order joined the Dark Angels and Consecrators Chapters in battle with Chaos Space Marines led by Typhus, the Chaos Champion of Nurgle.
The Knights of the Crimson Order wear slate grey Power Armour with crimson robes and red trim on their shoulder plates.
This Knights of the Crimson Order's Chapter badge is not listed in current Imperial records.
- The Unforgiven (Novel) by Gav Thorpe, pp. 132, 139, 142-144, 148-149, 151, 165, 174, 190, 198