I've been trying to work out where all the factions are and under what circumstances they appear, and I've gotten it all figured out, with one exception: the Ostrogoths.

I have read in several places that the Ostrogoths work similarly to the Roman Rebel factions - they emerge if a Goth city or general rebels. But the Goths don't have the Loyalty thing, so how can a general rebel? I've never seen the Ostrogoths appear in any BI campaign so far (though I've never actually played as the Goths) so my question to those who have is: How/When/Why (it at all) do the Ostrogoths emerge?

Antagonist