Quote Originally Posted by caravel View Post
The "peoples" you refer to are rebels. You do see something like e.g. "the revolt is led by the Frisians" or similar appearing in game during such uprisings (particularly in the pre battle screen if I recall correctly).
Never saw such notices. When I do have revolts they are either loyalist, religious (like muslim rebels, for example), or unspecified. Never had them identified by nationality. Or, perhaps, I didn't pay attention to pre-battle screens (if it is there that the notice appears) while fighting against rebels.