What can cause Barbarian Uprisings?

[IndyPendant]

Hi all.

I can't find anything in Teh Buk--but I just want to make sure I'm not the victim of a subtle assault.

Is there anything besides a "True Random Event" that can cause barbarians to revolt in a province? (An anonymous spell, say, or a stealth ability?)

The reason I ask is, I'm in two MP games currently: the first is at around Turn 32, and I have suffered one or two total uprisings. The second is only around Turn 18--and in that game, I have suffered no less than SIX uprisings, *and* a 'band of heroes' attacking my capital!

(--In both games, my scales are Order 3/Misfortune 3, but somehow I don't think that would be critical, mostly because the uprisings seem to happen in both white- and black-candle provinces.)

Thanks in advance!