My Poland game after about 23 years.
I'm leading a personal union with Lithuania, so they are like an ally, with a chance to be integrated into my country each time my ruler dies, although Poland my be the exception to that rule because of one of their national decisions.
I've diplo-annexed one of my Vassals, Mazovia, and in the process of diplo-annexing Moldavia.
I was allied with Pomerania, and help then in a war, they have since broke the alliance though.
I attacked the Teutonic Order and took 3 provinces, Danzig, Chelmno, and Ponzan. I had to give Ponzan to the HRE as they claimed it and I got an event that had them ask for it, and I didn't want to piss off the HRE nations, I was already disliked after attacking Teutonic Order.
I plan to finish off Teutonic Order once the truce period ends. from there, I'll probably lay back for a while and tech up and improve economy.