The Ferali are a recent (1315 or so) innovation of the Count's. If you notice that this date is after Marius's arrival in Dalmatia, you get the prize. Yes, Marius had a lot to do with their creation, and has a lot to do with their supervision.
The whole thing with the Count wanting the Rock from Lidija was so that he (and Marius) would have an isolated, private, easily-defensible place to use as the headquarters and training ground for this new kind of soldier.
That sounds too spooky ... "new kind of soldier." I basically just mean that Marius (who is a bit brighter than his boss) realized that using men trained in traditional echelon tactics in largely unfamiliar, hostile-native-guerilla-occupied mountain terrain, is just sending men into a meatgrinder. Historically, the King of Hungary found the same thing out fighting the Vlachs of what-will-be Romania not that long ago. The Soviets were up against the same thing in Afghanistan, except the Soviets had attack helicopters and heavy artillery.
So your average Ferali man-at-arms is: