Dragon Age: Ascension
Each freehold chooses the bann or arl to whom it pays allegiance. Typically, this choice is made based on proximity of the freehold to the lord’s castle (as it’s rarely worthwhile to pay for the upkeep of soldiers who will arrive at one’s lands too late to defend them). For the most part, each generation of freeholders casts its lot with the same bann as the previous generation did, but things can and do change. No formal oaths are sworn, and it is not unheard of, especially in the prickly central Bannorn, for banns to court freeholders away from their neighbors – a practice tending to ignite feuds that can last for ages.