I played a minor more than once
I`ve conquered bosnia, bulgaria, ragusa, albania, bulgaria, macedonia, thrace, rumelia, dobrudja and magyar with Serbia, but the AI wouldn`t let me enjoy my the spoils of war... I was constantly being attacked from everyone in europe that could somehow reach me, either by see, or by land, and as soon as i made peace with everyone after years of war and a pretty high rate of inflation, there would always be sombody else that would declare war, and then all over again, massive declarations of war... I got pissed so i quit... there was no way i could maintain my pretty large realm. However, if you have a few provinces more in the beginning, and cores on all slav provinces... Glory is achievable... A good player would create a Slav Empire larger than any slav kingdom in history... But where is the scenario? I could edit something like that, but i don`t know how to make leaders,flags,shields, and events.