Quote Originally Posted by sapi
Yes.

With 1.1 applied the ai will regularly launch naval invasions.

If anything, they do it a bit too much.
True. In my last game as Portugal I was under constant threat from invasions by Sicily, and both England and Scotland landed big stacks in the north, although it was 10-15 turns before they did anything other than stand there.

Oddly, I don't think the ai uses them for Crusades & Jihads. Or at least thats my explanation for seeing the Moors launching a Jihad on Constantanople, and then trying to get there by marching on a path through France, Italy & the Balkans. Must have needed the exercise...