I asked about a wild bretonian faction centered around chester, and was told that Bretonia was most equipped to deal with nomad infestation, and so a wild bretonian faction likely wouldn't work.
I still don't entirely understand why....I would think if the nomads had a base in Chester and 117 they would make infecting the BAF and Bretonian Gov't a high priority, if nomads have priorities, which I assume they do, but don't really know, and I'm also a fan of long run-on sentences, apparently.