I remember one game I played for CK2 where I started out as a Lithuanian tribe in 867. I worked my way up to reforming the Romuva religion and forming the Wendish Empire, and I went on a massive conquest spree of Europe. I remember I got two extremely lucky inheritances where one of my emperors inherited the Kingdom of Russia, which had gotten pretty massive that game, and another inherited the Empire of Scandinavia. Unfortunately I couldn't conquer all of Europe in that game. By the time 1453 rolled around, Sardinia, Scotland, and Ireland were still controlled by European Catholics, but it was roaring good fun cucking everyone under my dominion into becoming Lithuanian pagans.