So I just started a campaign as Tuscany, a 2 province country in the north of Italy:
The idea is to form Italy and become a major trade power in the mediterranean
After some small wars against single province minors, the first big war was a fact:
After Austria chain sieged about half my provinces (including their wargoal) France and Castille finally decided to send their armies to me instead of sieging the Netherlands..
Then something really rare happend and not exactly in my favor..:
Castille got the Iberian Wedding really early on in the game, when Naples still was under the PU with Aragon so Castille got both countries under PU and now controls Naples directly..
Plus, Austria got in a PU with Hungary and inherited it pretty soon after..
And unrelated but fun: The Mamluks are winning against the Ottomans
And so this is the current situation:
I control most of north Italy, I only need Ancona to form Italy but it's Aragon's who are under PU of Castille (who is my ally) and way to strong for me alone. France broke my alliance with them after they killed Savoy and Austria hates me because of all the unlawfull territory and aggresive expansion.
Savoy will be destroyed soon so that I can make a nice border in the mountains and Milan is my vassal but I ran into a great bug.. After I made peace out of my last war, the game continues to think I am at war so I can't diplo annex anyone.. (all screens and ledgers say I'm not at war..)