BTW, fomenting rebellions in one of your own provinces is a great way to fill your coffers and to train up generals and royal heirs. Pick a province that is prone to rebellion - Latvia, Portugal, etc. - take it over, give them a decent governor, max taxes and leave it poorly garrisoned. Don't build watch towers or town watches, but other improvements are OK. Don't put any spies in it, and leave them as a different religion if you can. Pretty soon you have a rebellion. Move in some more troops and put it down - and when you get the screeny asking what to do with the rebels choose "kill them all". Then do it again and again and again.... Your governor will start to get vices - at first just some dread, then more dread and increasing loyalty penalties. Each loyalty penalty just makes another rebellion more probable - in the end you get -50 loyalty and your governor is hated by the populance. The rebellions get bigger and bigger and the peasant troops get more and more teched. Each one you put down gives you more money and more experience for your troops.

When you tire of it, just strip the gov of his title and give it to someone who isn't hated, then build some happy buildings like watchtowers and a town watch.