Ottoman Empire through 1502
Vassals: Bosnia, Serbia, Wallachia, Transylvania, Hungary, Poland, Lithuania, Teutonic Order, Savoy, Switzerland. Personal Union with Morocco.
I tried to vassalize Wallachia and Moldavia early to block out the Golden Horde, but Poland beat me to Moldavia. Annexed and released Hungary, Poland, Lithuania, and TO. Diplo-annexed Tripoli. Forced Castille to release Morocco in a peace deal, as their lands were still entirely Sunni, then immediately forced them into a PU. Was going to get a forge documents CB on Oman as well, but the Timurids got in the way while I was waiting for our truce to expire, and I have no transport fleet built in the Red Sea yet. Might just be time to start attacking the Timurids again after years of conceding that I have better things to do.
My biggest problem right now is war exhaustion, since Catholic minor states are apparently suicidal and love to repeatedly declare holy wars on me, forgoing the protection of the Emperor and DotF, until I give in and annex them. My WE is constantly hovering between 5-10, and if I get a period of peace lasting even two years I've been extremely lucky. Since 1412, when I annexed Naples and the Papal States, I've only declared three actual wars in Europe, and those were to grab the remnants of Hungary, Poland, and the Teutonic Order so I could release them as vassals.
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Oh, and vassals that beat me to a siege with one cavalry regiment need to die in a fire. Seriously.