The odd thing about medieval is that for most of the games that I play I will be struggling for money and then there is usually a period where my treasury just expands rapidly, usually when I've completed my shipping empire. The the other coincidence is that when I reach 200000 florins I end up fighting lots of people.
Right now in my game as the Aragonese, the Italians and Spanish are both now at war with me even though I had never attacked either of them and had not even been attacking Christian empires for quite some time. Now I've been excommunicated so I am planning on a massive rampage.