Cleon
Legend
Then we might as well do a combined conversion, huh?
Yes, the Fiend Knights are pretty obviously a synonym for the Demonic Knights of Doom, since their units use the same emblems (tan horse & bronze baboon) as two of the Demonic Knight's units.
The main difference is the Demonic Knights also have a horse-archer regiment.
Oh, and I like the fact the Lesser Marshall has a +4 mace of disruption - presumably it is for keeping his undead thralls in line!