It is not yet close the time when we'll see Barons, but before they become Baron they will all be Mayor, and the time when we'll have Mayors select their settlement is near.
Why do i ask the question ?
Because most often when you hear talks about Baron, people talk about PvP skill and inclinations, they talk about fighters......
But the primary role of a Baron is not to fight, at least not more than it is the role of a lumberjack to be a carpenter or of a smith to be a swashbuckler.
The primary role of a Baron is to be an administrator, to run its settlement and to fulfill the contract it signed with the Duke. A contract that do not talk about fighting but about administration.
The contract between a Duke and a Baron is about building military oriented buildings and to maintain them, to recruit, feed, equip, train and support troops.
Not that a Baron able to fulfill that role and who's able on top to lead troops and fight is a bad thing, but combat prowess and leadership are not required, they are a bonus, while administration skills are required.
Keep that in mind when selecting your settlement or recruiting vassals, and do not forget, a baron is first a mayor and as such the vassal of a Count, a link that is not replaced, overruled or changed when the Mayor sign a Baron contract with the Duke, all Barons are the vassals and as such serve their liege lord the Count.