sub_faction [faction_name] is used when you set up the rebel armies in the descr_strat. Example:
Code:
character sub_faction byzantium, Georgios Attikos, named character, male, age 33, x 275, y 110
army
unit Greek Bodyguard exp 1 armour 0 weapon_lvl 0
It relates to the names available and also culture related items like the banner which can be changed to reflect different cultures. Need I explain about character model and speech?
The faction used has to be listed in the descr_sm_factions file, but does not need to be listed in the top lines of the descr_stat.