Crassmaster: Wanna see something terrifying? Go against the Papacy. There is nothing as horrible to see as a mass of armies coming at you from all of Europe because you pissed off the Pope and he's called for a Crusade against you.
keeveek: It actually depends. If a pope has a very low authority, and you have a large one for example, you rule the holy roman empire, it's not that bad to go against the Pope.
And as a muslim you may call jihads! :D
True. Of course, I was just some low level nobody in some backwater piece of Spain. So it was pretty much doom for me. :)
I haven't actually played as a Muslim ruler yet. Might have to do that when I finally load it up again.