1 force limit at 0 autonomy, but if you release it as a vassal it provides 1 force limit, plus the vassal has a base force limit of 3 (or 2 and 6 for a march), which is a big advantage in numbers. For instance, a 3 dev province only provides something like. The force limit that you get from vassals and marches is greater than the force limit from holding the land yourself.
