From Warhammer 40k - Lexicanum
Maulgrehn was a Captain of the Blood Angels Legion active during the Great Crusade and Horus Heresy.
During the Battle of Signus, Maulgrehn was initially charged with investigating Daemonic activity on Ta-Loc. Later during the battle of Signus Prime itself, he was overcome with the same rage that befell fellow officer Nassir Amit and took part in the slaughtering of the Space Wolves.
- 1: The Horus Heresy Book Eight - Malevolence, pgs. 45–75