Serbia is a militarist faction that is proud of the old ways of spears, on both horse and foot. These in turn are further reinforced by the cavalry in the Byzantine style, and later by halberdiers, heavy crossbow, and a number of mercenaries, including the famous Almogavers of Catalan Spain and ubiquitous hussars.
NB: Serbia is not able to build advanced heavy siege equipment or Imperial-Era super heavy ships, but can still train the "Hospitaller" line from the Nobles' Court.